Game 1 Unit 36 of 64 1 hr learning time
Hit Zone Animation
Make the hit zones pulse to the beat, creating visual rhythm cues that help players time their inputs perfectly.
56% of SID Symphony
Rhythm games live and die by timing feedback. When players can’t feel the beat, they struggle. This unit makes the hit zones pulse to the rhythm—flashing bright on each beat and fading through the interval. A simple visual cue that transforms playability.
Run It
Assemble and run:
acme -f cbm -o symphony.prg symphony.asm
Start a song and watch the hit zones. On each beat, they flash white and fade through light green back to yellow. This pulsing matches the music exactly, helping players internalise the rhythm.
Leveraging Existing Infrastructure
We already have beat timing in place. The beat_pulse variable is set to 8 on each new beat:
; Trigger beat pulse on every new beat
lda #8 ; Pulse duration (frames)
sta beat_pulseAnd update_beat_marker already decrements this each frame, creating a countdown from 8 to 0. We simply extend this routine to also update the hit zones.
Colour Pulse Table
We define a colour sequence that fades from bright to normal:
; Hit zone pulse colours - bright to normal
hitzone_pulse_cols:
!byte 1 ; White (brightest on beat)
!byte 13 ; Light green
!byte 7 ; Yellow
!byte 7 ; Yellow (normal)The sequence goes: white → light green → yellow → yellow. The final value matches the hit zone’s normal colour, so the animation ends where it started.
Calculating the Colour Index
We convert beat_pulse (0-8) to a colour index (0-3):
lda beat_pulse
lsr ; Divide by 2
and #$03 ; Keep in range 0-3
tax
lda hitzone_pulse_cols,x| beat_pulse | After LSR | After AND #$03 | Colour |
|---|---|---|---|
| 8 | 4 | 0 | White |
| 7 | 3 | 3 | Yellow |
| 6 | 3 | 3 | Yellow |
| 5 | 2 | 2 | Yellow |
| 4 | 2 | 2 | Yellow |
| 3 | 1 | 1 | Light green |
| 2 | 1 | 1 | Light green |
| 1 | 0 | 0 | White |
| 0 | (not pulsing) |
This creates a quick flash to white, then a gradual fade back through lighter colours.
Updating All Three Hit Zones
With the colour calculated, we update all three tracks:
sta COLRAM + (TRACK1_ROW * 40) + HIT_ZONE_COLUMN
sta COLRAM + (TRACK2_ROW * 40) + HIT_ZONE_COLUMN
sta COLRAM + (TRACK3_ROW * 40) + HIT_ZONE_COLUMNUsing constants (TRACK1_ROW, HIT_ZONE_COLUMN) rather than magic numbers makes the code self-documenting and easy to adjust if the layout changes.
Resetting to Normal
When the pulse ends (beat_pulse reaches 0), we reset to the standard hit zone colour:
beat_marker_dim:
; Show dim marker when not pulsing
...
; Reset hit zone to normal colour
lda #HIT_ZONE_COL ; Yellow (7)
sta COLRAM + (TRACK1_ROW * 40) + HIT_ZONE_COLUMN
sta COLRAM + (TRACK2_ROW * 40) + HIT_ZONE_COLUMN
sta COLRAM + (TRACK3_ROW * 40) + HIT_ZONE_COLUMNThis ensures the hit zones return to their standard appearance between beats, ready for the next pulse.
Why This Matters
Visual rhythm cues serve several purposes:
| Benefit | Explanation |
|---|---|
| Timing anticipation | Players see the beat coming |
| Rhythm internalisation | Visual + audio reinforcement |
| Accessibility | Helps players who struggle with audio-only timing |
| Professional feel | Adds polish that players expect from rhythm games |
Even players who aren’t consciously watching the hit zones benefit—the peripheral visual pulse helps them feel the rhythm.
Try This
- Different colour schemes - Try red→orange→yellow for a warm pulse
- Intensity variation - Brighter pulse at higher combos
- Track-specific colours - Each track pulses a different colour
- Extended pulse - Longer pulse duration for slower songs
Performance Note
We’re updating 3 colour RAM locations per frame during the pulse—trivially cheap. Colour RAM writes don’t need VIC-II timing synchronisation, so there’s no flicker concern.
The Complete Code
; ============================================================================
; SID SYMPHONY - Unit 36: Hit Zone Animation
; ============================================================================
; The hit zone pulses to the beat, creating visual rhythm that helps players
; time their inputs. This visual feedback makes the game feel more alive.
;
; New features:
; - Hit zone colour pulses brighter on each beat
; - Animation synced to song tempo via beat_pulse variable
; - Smooth fade from bright to normal between beats
; - Visual cue helps players anticipate timing
;
; Controls: Z = Track 1, X = Track 2, C = Track 3
; Up/Down = Song selection, Left/Right = Difficulty
; P = Toggle practice mode, +/- = Speed adjustment
; E = Toggle endless mode
; Fire/Space = Start game
; ============================================================================
; ============================================================================
; CUSTOMISATION SECTION
; ============================================================================
; Screenshot mode - set to 1 to skip title and show menu immediately
; Used for automated screenshot capture. Override with: acme -DSCREENSHOT_MODE=1
!ifndef SCREENSHOT_MODE { SCREENSHOT_MODE = 0 }
; Video mode - set to 1 to skip title AND auto-start gameplay on first song
; Used for automated video capture. Override with: acme -DVIDEO_MODE=1
!ifndef VIDEO_MODE { VIDEO_MODE = 0 }
; SID Voice Settings (for note playback)
VOICE1_WAVE = $21 ; Sawtooth for track 1
VOICE2_WAVE = $41 ; Pulse for track 2
VOICE3_WAVE = $11 ; Triangle for track 3
VOICE1_FREQ = $1C
VOICE2_FREQ = $0E
VOICE3_FREQ = $07
VOICE_AD = $09 ; Attack=0, Decay=9
VOICE_SR = $00 ; Sustain=0, Release=0
PULSE_WIDTH = $08
; Perfect hit sound - bright and satisfying
PERFECT_SFX_FREQ = $30 ; Higher pitch
PERFECT_SFX_WAVE = $21 ; Sawtooth (bright)
PERFECT_SFX_AD = $08 ; Fast attack, medium decay
PERFECT_SFX_SR = $00 ; No sustain
; Good hit sound - positive but lesser
GOOD_SFX_FREQ = $20 ; Lower pitch than perfect
GOOD_SFX_WAVE = $11 ; Triangle (softer)
GOOD_SFX_AD = $0A ; Slightly slower decay
GOOD_SFX_SR = $00 ; No sustain
; Miss sound settings - harsh buzz
MISS_FREQ = $08
MISS_WAVE = $81 ; Noise
MISS_AD = $00 ; Instant attack
MISS_SR = $A0 ; Quick sustain, fast release
; Menu sound settings
MENU_SELECT_FREQ = $18 ; Menu click pitch
MENU_SELECT_WAVE = $41 ; Pulse for click
MENU_SELECT_AD = $00 ; Instant
MENU_SELECT_SR = $80 ; Very short
MENU_MOVE_FREQ = $10 ; Lower pitch for cursor move
MENU_MOVE_WAVE = $11 ; Triangle (soft)
MENU_MOVE_AD = $00 ; Instant
MENU_MOVE_SR = $40 ; Very short
; Visual Settings
BORDER_COL = 0
BG_COL = 0
TRACK1_NOTE_COL = 10 ; Light red for high track
TRACK2_NOTE_COL = 13 ; Light green for mid track
TRACK3_NOTE_COL = 14 ; Light blue for low track
TRACK_LINE_COL = 11 ; Grey for track lines
HIT_ZONE_COL = 7 ; Yellow for hit zone
HIT_COL = 1
PERFECT_COL = 1 ; White flash for perfect
GOOD_COL = 7 ; Yellow flash for good
MISS_COL = 2 ; Red flash for miss
HEALTH_COL = 5 ; Green for health bar
PROGRESS_COL = 3 ; Cyan for progress bar
COMBO_COL = 13 ; Light green for combo
; Title screen colours
TITLE_COL = 1 ; White for title
SUBTITLE_COL = 11 ; Grey for subtitle
MENU_COL = 7 ; Yellow for menu items
CURSOR_COL = 1 ; White for cursor
EASY_COL = 5 ; Green for Easy
NORMAL_COL = 7 ; Yellow for Normal
HARD_COL = 2 ; Red for Hard
; ============================================================================
; SCORING SETTINGS (BALANCED)
; ============================================================================
PERFECT_SCORE = 100 ; Perfect hit value
GOOD_SCORE = 50 ; Good hit value
; Streak bonuses (awarded every N consecutive perfects)
STREAK_THRESHOLD = 5 ; Perfect streak bonus every 5 perfects
STREAK_BONUS = 50 ; Bonus points per streak milestone
; Section completion bonuses (25%, 50%, 75%, 100%)
SECTION_BONUS = 100 ; Bonus per section completed
; Full combo bonus (no misses)
FULL_COMBO_BONUS = 200 ; Bonus if no misses entire song
; Performance grade thresholds (based on accuracy percentage)
; Accuracy = (perfect_count * 100 + good_count * 50) / total_notes
GRADE_S_THRESHOLD = 95 ; 95%+ perfect rate = S rank
GRADE_A_THRESHOLD = 85 ; 85%+ = A rank
GRADE_B_THRESHOLD = 70 ; 70%+ = B rank
GRADE_C_THRESHOLD = 50 ; 50%+ = C rank
; Below 50% = D rank
; ============================================================================
; COMBO SETTINGS (BALANCED)
; ============================================================================
COMBO_TIER_2 = 10 ; 2x multiplier at 10 hits
COMBO_TIER_3 = 25 ; 3x multiplier at 25 hits
COMBO_TIER_4 = 50 ; 4x multiplier at 50 hits
; Combo border colours (escalating intensity)
COMBO_BORDER_0 = 0 ; Black - no combo
COMBO_BORDER_1 = 11 ; Dark grey - building
COMBO_BORDER_2 = 5 ; Green - 2x (tier 2)
COMBO_BORDER_3 = 7 ; Yellow - 3x (tier 3)
COMBO_BORDER_4 = 2 ; Red - 4x (tier 4 / fire!)
; ============================================================================
; HEALTH SETTINGS (BASE VALUES - MODIFIED BY DIFFICULTY)
; ============================================================================
HEALTH_MAX = 64 ; Maximum health
HEALTH_START = 32 ; Start at half health
HEALTH_PERFECT = 4 ; Gain 4 for perfect
HEALTH_GOOD = 2 ; Gain 2 for good
; Health loss per difficulty
HEALTH_MISS_EASY = 4 ; Forgiving
HEALTH_MISS_NORMAL = 8 ; Balanced
HEALTH_MISS_HARD = 12 ; Punishing
; ============================================================================
; HIT DETECTION SETTINGS (BASE - MODIFIED BY DIFFICULTY)
; ============================================================================
; Hit zone column range (where notes can be hit)
HIT_ZONE_START = 2 ; Leftmost hittable column
HIT_ZONE_END = 6 ; Rightmost hittable column
; Perfect timing column (centre of hit zone)
PERFECT_COL_POS = 4
; Beat marker position (visual rhythm indicator)
HIT_ROW = 20 ; Row for beat marker display
; Timing windows per difficulty (columns from perfect)
; Easy: Perfect ±2, Good ±4
; Normal: Perfect ±1, Good ±2
; Hard: Perfect ±0, Good ±1
PERFECT_WINDOW_EASY = 2
PERFECT_WINDOW_NORMAL = 1
PERFECT_WINDOW_HARD = 0
GOOD_WINDOW_EASY = 4
GOOD_WINDOW_NORMAL = 2
GOOD_WINDOW_HARD = 1
; ============================================================================
; DIFFICULTY SETTINGS
; ============================================================================
DIFF_EASY = 0
DIFF_NORMAL = 1
DIFF_HARD = 2
; ============================================================================
; SONG SETTINGS
; ============================================================================
PROGRESS_WIDTH = 16 ; Progress bar width
; Per-song tempo (frames per beat)
TEMPO_SONG1 = 25 ; 120 BPM
TEMPO_SONG2 = 23 ; 130 BPM
TEMPO_SONG3 = 20 ; 150 BPM
TEMPO_SONG4 = 24 ; 125 BPM (syncopated feel)
TEMPO_SONG5 = 22 ; 136 BPM (chord-focused)
TEMPO_SONG6 = 23 ; 130 BPM (balanced for mixed techniques)
; Per-song length (beats)
LENGTH_SONG1 = 64
LENGTH_SONG2 = 64
LENGTH_SONG3 = 64
LENGTH_SONG4 = 64
LENGTH_SONG5 = 64
LENGTH_SONG6 = 64
; ============================================================================
; MENU SETTINGS
; ============================================================================
NUM_SONGS = 6
KEY_DELAY = 10 ; Frames between key repeats
; ============================================================================
; PRACTICE MODE SETTINGS
; ============================================================================
; Speed multipliers (stored as frame adjustment)
; Higher value = slower (more frames per beat)
SPEED_HALF = 2 ; 0.5x speed (double frames)
SPEED_3QRTR = 1 ; 0.75x speed (4/3 frames, approx +1)
SPEED_NORMAL = 0 ; 1.0x speed (no adjustment)
NUM_SPEEDS = 3
PRACTICE_COL = 3 ; Cyan for practice mode indicator
; ============================================================================
; GAME STATES
; ============================================================================
STATE_TITLE = 0 ; Title screen
STATE_MENU = 1 ; Song selection menu
STATE_PLAYING = 2 ; Gameplay
STATE_RESULTS = 3 ; Success results
STATE_GAMEOVER = 4 ; Failure game over
STATE_ATTRACT = 5 ; Attract mode / demo
; Attract mode settings
IDLE_THRESHOLD = 250 ; Frames before attract (5 seconds at 50fps)
; ============================================================================
; MEMORY MAP
; ============================================================================
SCREEN = $0400
COLRAM = $D800
BORDER = $D020
BGCOL = $D021
CHARPTR = $D018
CHARSET = $3000
; SID registers
SID = $D400
SID_V1_FREQ_LO = $D400
SID_V1_FREQ_HI = $D401
SID_V1_PWHI = $D403
SID_V1_CTRL = $D404
SID_V1_AD = $D405
SID_V1_SR = $D406
SID_V2_FREQ_LO = $D407
SID_V2_FREQ_HI = $D408
SID_V2_PWHI = $D40A
SID_V2_CTRL = $D40B
SID_V2_AD = $D40C
SID_V2_SR = $D40D
SID_V3_FREQ_LO = $D40E
SID_V3_FREQ_HI = $D40F
SID_V3_PWHI = $D411
SID_V3_CTRL = $D412
SID_V3_AD = $D413
SID_V3_SR = $D414
SID_VOLUME = $D418
; CIA keyboard and joystick
CIA1_PRA = $DC00
CIA1_PRB = $DC01
; Track positions (balanced spacing)
TRACK1_ROW = 8 ; High track
TRACK2_ROW = 12 ; Mid track
TRACK3_ROW = 16 ; Low track
; HUD positions
HEALTH_ROW = 23 ; Health bar row
PROGRESS_ROW = 24 ; Progress bar row
; Combo display position
COMBO_ROW = 2 ; Combo display row
; Hit zone
HIT_ZONE_COLUMN = 3 ; Where notes are hit (visual)
; Custom character codes
CHAR_NOTE = 128
CHAR_TRACK = 129
CHAR_HITZONE = 130
CHAR_SPACE = 32
CHAR_BAR_FULL = 131
CHAR_BAR_EMPTY = 132
CHAR_CURSOR = 62 ; > character for menu cursor
CHAR_ARROW_L = 60 ; < for difficulty
CHAR_ARROW_R = 62 ; > for difficulty
; Logo characters (for title screen design)
CHAR_LOGO_TL = 133 ; Top-left corner
CHAR_LOGO_TR = 134 ; Top-right corner
CHAR_LOGO_BL = 135 ; Bottom-left corner
CHAR_LOGO_BR = 136 ; Bottom-right corner
CHAR_LOGO_H = 137 ; Horizontal bar
CHAR_LOGO_V = 138 ; Vertical bar
CHAR_LOGO_FULL = 139 ; Full block
CHAR_LOGO_HALF_T = 140 ; Half block top
CHAR_LOGO_HALF_B = 141 ; Half block bottom
CHAR_LOGO_DOT = 142 ; Centre dot (for decorative)
; Note settings
MAX_NOTES = 8 ; Maximum simultaneous notes
NOTE_SPAWN_COL = 37 ; Where notes appear
; Timing
END_DELAY_FRAMES = 75 ; 1.5 seconds after song ends
; Zero page
ZP_PTR = $FB
ZP_PTR_HI = $FC
ZP_TEMP = $FD ; Temporary calculation
; Variables
frame_count = $02
beat_count = $03
song_pos = $04
song_pos_hi = $05
temp_track = $06
key_pressed = $07
hit_quality = $08
border_flash = $09
miss_track = $0A
game_state = $0B
hit_note_freq = $0C
song_beat = $0D
song_ended = $0E
end_delay = $0F
cursor_pos = $10 ; Menu cursor position
key_delay_count = $11 ; Key repeat delay counter
selected_song = $12 ; Which song to play
frames_per_beat = $13 ; Current song's tempo
song_length = $14 ; Current song's length
difficulty = $15 ; 0=Easy, 1=Normal, 2=Hard
perfect_window = $16 ; Current perfect timing window
good_window = $17 ; Current good timing window
health_miss_amt = $18 ; Health loss on miss
practice_mode = $19 ; 0=Normal play, 1=Practice mode
speed_setting = $1A ; 0=0.5x, 1=0.75x, 2=1.0x
bg_flash = $1B ; Background flash countdown (visual polish)
beat_pulse = $1C ; Beat marker pulse state
endless_mode = $1D ; 0=Normal (song ends), 1=Endless (loops)
loop_count = $1E ; Number of loops completed in endless mode
perfect_streak = $1F ; Current consecutive perfect hits
best_streak = $20 ; Best perfect streak this song
section_bonus = $21 ; Accumulated section bonus points
notes_hit = $22 ; Total notes hit (for accuracy calc)
current_grade = $23 ; Current performance grade letter (screen code)
current_grade_col = $24 ; Colour for current grade
title_anim_frame = $25 ; Title screen animation frame counter
idle_timer = $26 ; Frames since last input (for attract mode)
attract_note_idx = $27 ; Demo playback note index
attract_timer = $28 ; Demo timing counter
; ----------------------------------------------------------------------------
; BASIC Stub
; ----------------------------------------------------------------------------
* = $0801
!byte $0C, $08
!byte $0A, $00
!byte $9E
!text "2064"
!byte $00
!byte $00, $00
; ----------------------------------------------------------------------------
; Main Program
; ----------------------------------------------------------------------------
* = $0810
start:
jsr copy_charset
jsr init_sid
; Start with Normal difficulty
lda #DIFF_NORMAL
sta difficulty
; Practice mode off, normal speed
lda #0
sta practice_mode
lda #NUM_SPEEDS-1 ; Start at 1.0x (normal speed)
sta speed_setting
!if VIDEO_MODE = 1 {
; Video mode: skip title, start first song immediately
; Initialize menu (sets cursor_pos = 0 for first song)
jsr show_menu
; Trigger fire pressed to start the game
jsr menu_fire_pressed
; State is now STATE_PLAYING
} else {
!if SCREENSHOT_MODE = 1 {
; Screenshot mode: skip title, go to menu
jsr show_menu
lda #STATE_MENU
sta game_state
} else {
; Normal mode: show title screen
jsr show_title
lda #STATE_TITLE
sta game_state
}
}
main_loop:
lda #$FF
wait_raster:
cmp $D012
bne wait_raster
lda game_state
cmp #STATE_TITLE
beq do_title
cmp #STATE_MENU
beq do_menu
cmp #STATE_PLAYING
beq do_playing
cmp #STATE_RESULTS
beq do_results
cmp #STATE_ATTRACT
beq do_attract
jmp do_gameover
do_title:
jsr update_title
jmp main_loop
do_attract:
jsr update_attract
jmp main_loop
do_menu:
jsr update_menu
jmp main_loop
do_playing:
jsr update_playing
jmp main_loop
do_results:
jsr update_results
jmp main_loop
do_gameover:
jsr update_gameover
jmp main_loop
; ----------------------------------------------------------------------------
; Show Title Screen
; ----------------------------------------------------------------------------
show_title:
; Clear screen
lda #BORDER_COL
sta BORDER
lda #BG_COL
sta BGCOL
ldx #0
lda #CHAR_SPACE
clear_title:
sta SCREEN,x
sta SCREEN+$100,x
sta SCREEN+$200,x
sta SCREEN+$2E8,x
inx
bne clear_title
; ----------------------------------------
; Draw decorative top border (row 2)
; ----------------------------------------
ldx #0
draw_top_border:
lda logo_top_border,x
beq draw_top_done
sta SCREEN + (2 * 40) + 10,x
lda #6 ; Blue
sta COLRAM + (2 * 40) + 10,x
inx
jmp draw_top_border
draw_top_done:
; ----------------------------------------
; Draw logo row 1 (row 4) - using block chars
; ----------------------------------------
ldx #0
draw_logo_row1:
lda logo_row1,x
beq draw_logo1_done
sta SCREEN + (4 * 40) + 12,x
lda #14 ; Light blue
sta COLRAM + (4 * 40) + 12,x
inx
jmp draw_logo_row1
draw_logo1_done:
; ----------------------------------------
; Draw logo row 2 (row 5)
; ----------------------------------------
ldx #0
draw_logo_row2:
lda logo_row2,x
beq draw_logo2_done
sta SCREEN + (5 * 40) + 12,x
lda #14 ; Light blue
sta COLRAM + (5 * 40) + 12,x
inx
jmp draw_logo_row2
draw_logo2_done:
; ----------------------------------------
; Draw logo row 3 (row 6)
; ----------------------------------------
ldx #0
draw_logo_row3:
lda logo_row3,x
beq draw_logo3_done
sta SCREEN + (6 * 40) + 12,x
lda #6 ; Blue
sta COLRAM + (6 * 40) + 12,x
inx
jmp draw_logo_row3
draw_logo3_done:
; ----------------------------------------
; Draw "SYMPHONY" text (row 8)
; ----------------------------------------
ldx #0
draw_symphony:
lda symphony_text,x
beq draw_symphony_done
sta SCREEN + (8 * 40) + 14,x
lda #1 ; White
sta COLRAM + (8 * 40) + 14,x
inx
jmp draw_symphony
draw_symphony_done:
; ----------------------------------------
; Draw decorative separator (row 10)
; ----------------------------------------
ldx #0
draw_separator:
lda separator_text,x
beq draw_sep_done
sta SCREEN + (10 * 40) + 10,x
lda #11 ; Dark grey
sta COLRAM + (10 * 40) + 10,x
inx
jmp draw_separator
draw_sep_done:
; ----------------------------------------
; Draw "A RHYTHM GAME" subtitle (row 12)
; ----------------------------------------
ldx #0
draw_subtitle:
lda subtitle_text,x
beq draw_subtitle_done
sta SCREEN + (12 * 40) + 13,x
lda #SUBTITLE_COL
sta COLRAM + (12 * 40) + 13,x
inx
jmp draw_subtitle
draw_subtitle_done:
; ----------------------------------------
; Draw controls info (row 15)
; ----------------------------------------
ldx #0
draw_controls:
lda controls_text,x
beq draw_controls_done
sta SCREEN + (15 * 40) + 10,x
lda #11 ; Dark grey
sta COLRAM + (15 * 40) + 10,x
inx
jmp draw_controls
draw_controls_done:
; ----------------------------------------
; Draw track keys (row 17)
; ----------------------------------------
ldx #0
draw_track_keys:
lda track_keys_text,x
beq draw_keys_done
sta SCREEN + (17 * 40) + 8,x
lda #15 ; Light grey
sta COLRAM + (17 * 40) + 8,x
inx
jmp draw_track_keys
draw_keys_done:
; ----------------------------------------
; Draw "PRESS FIRE TO START" (row 21)
; ----------------------------------------
ldx #0
draw_press_fire:
lda press_fire_text,x
beq draw_press_done
sta SCREEN + (21 * 40) + 10,x
lda #7 ; Yellow
sta COLRAM + (21 * 40) + 10,x
inx
jmp draw_press_fire
draw_press_done:
; ----------------------------------------
; Draw version (row 24)
; ----------------------------------------
ldx #0
draw_version:
lda version_text,x
beq draw_version_done
sta SCREEN + (24 * 40) + 14,x
lda #11 ; Dark grey
sta COLRAM + (24 * 40) + 14,x
inx
jmp draw_version
draw_version_done:
rts
; Logo data using custom block characters
; Creates a stylized "SID" in large block letters
logo_top_border:
!byte CHAR_LOGO_TL, CHAR_LOGO_H, CHAR_LOGO_H, CHAR_LOGO_H
!byte CHAR_LOGO_H, CHAR_LOGO_H, CHAR_LOGO_H, CHAR_LOGO_H
!byte CHAR_LOGO_H, CHAR_LOGO_H, CHAR_LOGO_H, CHAR_LOGO_H
!byte CHAR_LOGO_H, CHAR_LOGO_H, CHAR_LOGO_H, CHAR_LOGO_H
!byte CHAR_LOGO_H, CHAR_LOGO_H, CHAR_LOGO_H, CHAR_LOGO_TR
!byte 0
logo_row1:
; S I D
!byte CHAR_LOGO_FULL, CHAR_LOGO_FULL, CHAR_LOGO_FULL, CHAR_SPACE
!byte CHAR_LOGO_FULL, CHAR_LOGO_FULL, CHAR_LOGO_FULL, CHAR_SPACE
!byte CHAR_LOGO_FULL, CHAR_LOGO_FULL, CHAR_LOGO_FULL, CHAR_SPACE
!byte CHAR_SPACE, CHAR_SPACE, CHAR_SPACE, CHAR_SPACE
!byte 0
logo_row2:
; S I D
!byte CHAR_LOGO_FULL, CHAR_LOGO_FULL, CHAR_LOGO_FULL, CHAR_SPACE
!byte CHAR_SPACE, CHAR_LOGO_FULL, CHAR_SPACE, CHAR_SPACE
!byte CHAR_LOGO_FULL, CHAR_SPACE, CHAR_LOGO_FULL, CHAR_SPACE
!byte CHAR_SPACE, CHAR_SPACE, CHAR_SPACE, CHAR_SPACE
!byte 0
logo_row3:
; S I D
!byte CHAR_LOGO_FULL, CHAR_LOGO_FULL, CHAR_LOGO_FULL, CHAR_SPACE
!byte CHAR_LOGO_FULL, CHAR_LOGO_FULL, CHAR_LOGO_FULL, CHAR_SPACE
!byte CHAR_LOGO_FULL, CHAR_LOGO_FULL, CHAR_LOGO_FULL, CHAR_SPACE
!byte CHAR_SPACE, CHAR_SPACE, CHAR_SPACE, CHAR_SPACE
!byte 0
symphony_text:
!scr "s y m p h o n y"
!byte 0
separator_text:
!byte CHAR_LOGO_DOT, CHAR_SPACE, CHAR_LOGO_H, CHAR_LOGO_H
!byte CHAR_LOGO_H, CHAR_LOGO_H, CHAR_LOGO_H, CHAR_LOGO_H
!byte CHAR_LOGO_H, CHAR_LOGO_H, CHAR_LOGO_H, CHAR_LOGO_H
!byte CHAR_LOGO_H, CHAR_LOGO_H, CHAR_LOGO_H, CHAR_LOGO_H
!byte CHAR_LOGO_H, CHAR_LOGO_H, CHAR_SPACE, CHAR_LOGO_DOT
!byte 0
subtitle_text:
!scr "a rhythm game"
!byte 0
controls_text:
!scr "controls: z / x / c"
!byte 0
track_keys_text:
!scr "hit notes as they pass the zone"
!byte 0
press_fire_text:
!scr "press fire to start"
!byte 0
version_text:
!scr "phase 3 v0.4"
!byte 0
; ----------------------------------------------------------------------------
; Update Title State
; ----------------------------------------------------------------------------
update_title:
; ----------------------------------------
; Animate title screen
; ----------------------------------------
jsr animate_title
; ----------------------------------------
; Check for input
; ----------------------------------------
; Check for fire button (joystick port 2)
lda CIA1_PRA
and #$10 ; Bit 4 = fire
beq title_fire_pressed
; Also check space bar as alternative
lda #$7F
sta CIA1_PRA
lda CIA1_PRB
and #$10 ; Space
beq title_fire_pressed
; No input - increment idle timer
lda #$FF
sta CIA1_PRA
; Increment idle timer and check threshold
inc idle_timer
lda idle_timer
cmp #IDLE_THRESHOLD
bcc title_no_attract
; Idle threshold reached - start attract mode
jsr show_attract
lda #STATE_ATTRACT
sta game_state
title_no_attract:
rts
title_fire_pressed:
; Reset idle timer on any input
lda #0
sta idle_timer
lda #$FF
sta CIA1_PRA
; Play menu select sound
jsr play_menu_select
; Go to song selection menu
jsr show_menu
lda #STATE_MENU
sta game_state
rts
; ----------------------------------------------------------------------------
; Animate Title Screen
; ----------------------------------------------------------------------------
; Called every frame while on title. Creates visual polish:
; - Logo colour cycles through blues
; - "PRESS FIRE" pulses between yellow and white
; ----------------------------------------------------------------------------
animate_title:
; Increment animation frame
inc title_anim_frame
; ----------------------------------------
; Logo colour cycling (every 8 frames)
; ----------------------------------------
lda title_anim_frame
and #$18 ; Check bits 3-4 (cycle every 8-24 frames)
lsr
lsr
lsr ; Now 0, 1, 2, or 3
tax
lda logo_colours,x
; Apply to logo row 1 (row 4)
ldx #15
anim_logo1:
sta COLRAM + (4 * 40) + 12,x
dex
bpl anim_logo1
; Apply to logo row 2 (row 5)
ldx #15
anim_logo2:
sta COLRAM + (5 * 40) + 12,x
dex
bpl anim_logo2
; ----------------------------------------
; "PRESS FIRE" colour pulse (every 16 frames)
; ----------------------------------------
lda title_anim_frame
and #$10 ; Toggle every 16 frames
beq press_fire_yellow
lda #1 ; White
jmp set_press_fire_col
press_fire_yellow:
lda #7 ; Yellow
set_press_fire_col:
ldx #18 ; Length of "press fire to start"
anim_press_fire:
sta COLRAM + (21 * 40) + 10,x
dex
bpl anim_press_fire
rts
; Logo colour cycle table (blues and cyan)
logo_colours:
!byte 14 ; Light blue
!byte 6 ; Blue
!byte 3 ; Cyan
!byte 14 ; Light blue
; ----------------------------------------------------------------------------
; Attract Mode
; ----------------------------------------------------------------------------
; Auto-plays a demo when the title screen is idle for too long.
; Demonstrates the game to entice players. Any input returns to title.
; ----------------------------------------------------------------------------
show_attract:
; Set up for demo playback
lda #0
sta attract_note_idx
sta attract_timer
sta score_lo
sta score_hi
sta combo
sta miss_count
sta notes_hit
; Use song 1 (easiest) for demo
lda #0
sta selected_song
sta song_pos
sta song_pos_hi
sta frame_count
; Initialise health for display
lda #HEALTH_START
sta health
; Set up screen (clear, draw tracks, hit zones)
jsr init_screen
; Initialise notes array
jsr init_notes
; Show demo overlay message at top
ldx #0
draw_demo_text:
lda demo_overlay_text,x
beq draw_demo_done
sta SCREEN + (0 * 40) + 16,x
lda #7 ; Yellow
sta COLRAM + (0 * 40) + 16,x
inx
jmp draw_demo_text
draw_demo_done:
; Show "PRESS ANY KEY" message
ldx #0
draw_press_any:
lda press_any_text,x
beq draw_press_any_done
sta SCREEN + (24 * 40) + 11,x
lda #1 ; White (flashing later)
sta COLRAM + (24 * 40) + 11,x
inx
jmp draw_press_any
draw_press_any_done:
rts
; ----------------------------------------------------------------------------
; Update Attract Mode
; ----------------------------------------------------------------------------
; Runs demo playback and checks for any input to exit.
; ----------------------------------------------------------------------------
update_attract:
; ----------------------------------------
; Check for any input to exit attract mode
; ----------------------------------------
; Check joystick (any direction or fire)
lda CIA1_PRA
and #$1F ; Check all joystick bits
cmp #$1F ; All released?
bne attract_exit
; Check common keys (space, return, F-keys)
lda #$7F
sta CIA1_PRA
lda CIA1_PRB
and #$10 ; Space
beq attract_exit
lda #$FF
sta CIA1_PRA
; ----------------------------------------
; Animate "PRESS ANY KEY" text
; ----------------------------------------
inc title_anim_frame
lda title_anim_frame
and #$10
beq attract_white
lda #7 ; Yellow
jmp attract_set_press
attract_white:
lda #1 ; White
attract_set_press:
ldx #16 ; "press any key" length
attract_press_loop:
sta COLRAM + (24 * 40) + 11,x
dex
bpl attract_press_loop
; ----------------------------------------
; Run demo playback
; ----------------------------------------
jsr demo_playback
rts
attract_exit:
lda #$FF
sta CIA1_PRA
; Reset idle timer
lda #0
sta idle_timer
sta title_anim_frame
; Return to title screen
jsr show_title
lda #STATE_TITLE
sta game_state
rts
; ----------------------------------------------------------------------------
; Demo Playback
; ----------------------------------------------------------------------------
; Simulates gameplay using pre-recorded note patterns.
; Notes move horizontally from right (column 37) to left (hit zone at column 2-6).
; Auto-hits notes when they reach the hit zone.
; ----------------------------------------------------------------------------
demo_playback:
; Increment demo timer
inc attract_timer
; Check if time to spawn a demo note (every 16 frames)
lda attract_timer
and #$0F
bne demo_update_notes
; Spawn note from demo pattern
ldx attract_note_idx
cpx #DEMO_PATTERN_LEN
bcc demo_spawn_note
; Pattern complete - restart
lda #0
sta attract_note_idx
tax
demo_spawn_note:
lda demo_pattern,x
beq demo_no_spawn ; 0 = no note this beat
; Find free note slot
ldy #0
demo_find_slot:
lda note_track,y
beq demo_use_slot ; 0 = empty slot
iny
cpy #MAX_NOTES
bcc demo_find_slot
jmp demo_no_spawn ; No free slots
demo_use_slot:
; Set track from demo pattern (1, 2, or 3)
lda demo_pattern,x
sta note_track,y
; Start at right edge
lda #NOTE_SPAWN_COL
sta note_col,y
; Draw the new note
tya
pha
txa
pha
tya
tax
jsr draw_note
pla
tax
pla
tay
demo_no_spawn:
inc attract_note_idx
demo_update_notes:
; Update all active notes (move left, check for hit zone)
ldx #0
demo_note_loop:
lda note_track,x
beq demo_next_note ; Skip empty slots
; Erase note at current position
jsr erase_note
; Move note left
dec note_col,x
; Check if note reached hit zone (column 2-6)
lda note_col,x
cmp #HIT_ZONE_START
bcs demo_draw_note ; Not at hit zone yet
; Note reached hit zone - auto-hit it!
; Remove the note
lda #0
sta note_track,x
; Flash border briefly for feedback
lda #1 ; White
sta $D020
; Increment score
inc score_lo
jmp demo_next_note
demo_draw_note:
; Draw note at new position
jsr draw_note
demo_next_note:
inx
cpx #MAX_NOTES
bcc demo_note_loop
; Reset border colour
lda #BORDER_COL
sta $D020
rts
; Demo pattern - which track (1, 2, or 3) to spawn note on, 0 = no note
; Simple pattern that demonstrates all 3 tracks
demo_pattern:
!byte 1, 0, 2, 0 ; Track 1, pause, Track 2, pause
!byte 3, 0, 1, 0 ; Track 3, pause, Track 1, pause
!byte 1, 2, 0, 0 ; Two quick notes (tracks 1 and 2)
!byte 2, 3, 0, 0 ; Two more quick (tracks 2 and 3)
!byte 1, 0, 0, 0 ; Single notes with space
!byte 2, 0, 0, 0
!byte 3, 0, 0, 0
!byte 1, 0, 0, 0
!byte 1, 2, 3, 0 ; Rapid fire all 3 tracks
!byte 0, 0, 0, 0 ; Pause
!byte 2, 0, 3, 0 ; Alternate pattern
!byte 1, 0, 2, 0
DEMO_PATTERN_LEN = * - demo_pattern
; Attract mode overlay texts
demo_overlay_text:
!scr "- demo -"
!byte 0
press_any_text:
!scr "press any key"
!byte 0
; ----------------------------------------------------------------------------
; Show Song Selection Menu
; ----------------------------------------------------------------------------
show_menu:
; Clear screen
ldx #0
lda #CHAR_SPACE
clear_menu:
sta SCREEN,x
sta SCREEN+$100,x
sta SCREEN+$200,x
sta SCREEN+$2E8,x
inx
bne clear_menu
; Initialise cursor
lda #0
sta cursor_pos
sta key_delay_count
; Draw menu title
ldx #0
draw_menu_title:
lda menu_title,x
beq draw_menu_title_done
sta SCREEN + (3 * 40) + 12,x
lda #TITLE_COL
sta COLRAM + (3 * 40) + 12,x
inx
jmp draw_menu_title
draw_menu_title_done:
; Draw song list
jsr draw_song_list
; Draw difficulty section
jsr draw_difficulty
; Draw practice mode section
jsr draw_practice_mode
; Draw instructions on row 24 (below Endless on row 23)
ldx #0
draw_menu_instr:
lda menu_instructions,x
beq draw_menu_instr_done
sta SCREEN + (24 * 40) + 1,x
lda #SUBTITLE_COL
sta COLRAM + (24 * 40) + 1,x
inx
jmp draw_menu_instr
draw_menu_instr_done:
rts
menu_title:
!scr "select a song"
!byte 0
menu_instructions:
!scr "up/down:song left/right:difficulty"
!byte 0
practice_instructions:
!scr "p:practice +/-:speed"
!byte 0
; ----------------------------------------------------------------------------
; Draw Song List
; ----------------------------------------------------------------------------
draw_song_list:
; Song 1: "First Steps" (120 BPM)
ldx #0
draw_song1:
lda song1_name,x
beq draw_song1_done
sta SCREEN + (8 * 40) + 14,x
lda #MENU_COL
sta COLRAM + (8 * 40) + 14,x
inx
jmp draw_song1
draw_song1_done:
; Song 1 tempo info
ldx #0
draw_tempo1:
lda song1_tempo_text,x
beq draw_tempo1_done
sta SCREEN + (8 * 40) + 27,x
lda #SUBTITLE_COL
sta COLRAM + (8 * 40) + 27,x
inx
jmp draw_tempo1
draw_tempo1_done:
; Song 2: "Upbeat Groove" (130 BPM)
ldx #0
draw_song2:
lda song2_name,x
beq draw_song2_done
sta SCREEN + (10 * 40) + 14,x
lda #MENU_COL
sta COLRAM + (10 * 40) + 14,x
inx
jmp draw_song2
draw_song2_done:
; Song 2 tempo info
ldx #0
draw_tempo2:
lda song2_tempo_text,x
beq draw_tempo2_done
sta SCREEN + (10 * 40) + 27,x
lda #SUBTITLE_COL
sta COLRAM + (10 * 40) + 27,x
inx
jmp draw_tempo2
draw_tempo2_done:
; Song 3: "Speed Rush" (150 BPM)
ldx #0
draw_song3:
lda song3_name,x
beq draw_song3_done
sta SCREEN + (12 * 40) + 14,x
lda #MENU_COL
sta COLRAM + (12 * 40) + 14,x
inx
jmp draw_song3
draw_song3_done:
; Song 3 tempo info
ldx #0
draw_tempo3:
lda song3_tempo_text,x
beq draw_tempo3_done
sta SCREEN + (12 * 40) + 27,x
lda #SUBTITLE_COL
sta COLRAM + (12 * 40) + 27,x
inx
jmp draw_tempo3
draw_tempo3_done:
; Song 4: "Off-Beat" (125 BPM)
ldx #0
draw_song4:
lda song4_name,x
beq draw_song4_done
sta SCREEN + (14 * 40) + 14,x
lda #MENU_COL
sta COLRAM + (14 * 40) + 14,x
inx
jmp draw_song4
draw_song4_done:
; Song 4 tempo info
ldx #0
draw_tempo4:
lda song4_tempo_text,x
beq draw_tempo4_done
sta SCREEN + (14 * 40) + 27,x
lda #SUBTITLE_COL
sta COLRAM + (14 * 40) + 27,x
inx
jmp draw_tempo4
draw_tempo4_done:
; Song 5: "Chordstorm" (136 BPM)
ldx #0
draw_song5:
lda song5_name,x
beq draw_song5_done
sta SCREEN + (16 * 40) + 14,x
lda #MENU_COL
sta COLRAM + (16 * 40) + 14,x
inx
jmp draw_song5
draw_song5_done:
; Song 5 tempo info
ldx #0
draw_tempo5:
lda song5_tempo_text,x
beq draw_tempo5_done
sta SCREEN + (16 * 40) + 27,x
lda #SUBTITLE_COL
sta COLRAM + (16 * 40) + 27,x
inx
jmp draw_tempo5
draw_tempo5_done:
; Song 6: "Fusion" (130 BPM)
ldx #0
draw_song6:
lda song6_name,x
beq draw_song6_done
sta SCREEN + (18 * 40) + 14,x
lda #MENU_COL
sta COLRAM + (18 * 40) + 14,x
inx
jmp draw_song6
draw_song6_done:
; Song 6 tempo info
ldx #0
draw_tempo6:
lda song6_tempo_text,x
beq draw_tempo6_done
sta SCREEN + (18 * 40) + 27,x
lda #SUBTITLE_COL
sta COLRAM + (18 * 40) + 27,x
inx
jmp draw_tempo6
draw_tempo6_done:
; Draw cursor at current position
jsr draw_cursor
rts
; Song names and info
song1_name:
!scr "first steps"
!byte 0
song1_tempo_text:
!scr "(120 bpm)"
!byte 0
song2_name:
!scr "upbeat groove"
!byte 0
song2_tempo_text:
!scr "(130 bpm)"
!byte 0
song3_name:
!scr "speed rush"
!byte 0
song3_tempo_text:
!scr "(150 bpm)"
!byte 0
song4_name:
!scr "off-beat"
!byte 0
song4_tempo_text:
!scr "(125 bpm)"
!byte 0
song5_name:
!scr "chordstorm"
!byte 0
song5_tempo_text:
!scr "(136 bpm)"
!byte 0
song6_name:
!scr "fusion"
!byte 0
song6_tempo_text:
!scr "(130 bpm)"
!byte 0
; ----------------------------------------------------------------------------
; Draw Difficulty Selection
; ----------------------------------------------------------------------------
draw_difficulty:
; Draw "DIFFICULTY:" label
ldx #0
draw_diff_label:
lda diff_label,x
beq draw_diff_label_done
sta SCREEN + (20 * 40) + 10,x
lda #TITLE_COL
sta COLRAM + (20 * 40) + 10,x
inx
jmp draw_diff_label
draw_diff_label_done:
; Draw arrows
lda #CHAR_ARROW_L
sta SCREEN + (20 * 40) + 22
lda #SUBTITLE_COL
sta COLRAM + (20 * 40) + 22
lda #CHAR_ARROW_R
sta SCREEN + (20 * 40) + 30
lda #SUBTITLE_COL
sta COLRAM + (20 * 40) + 30
; Draw current difficulty
jsr draw_current_difficulty
rts
diff_label:
!scr "difficulty:"
!byte 0
; ----------------------------------------------------------------------------
; Draw Current Difficulty Name
; ----------------------------------------------------------------------------
draw_current_difficulty:
; Clear difficulty name area
lda #CHAR_SPACE
sta SCREEN + (20 * 40) + 24
sta SCREEN + (20 * 40) + 25
sta SCREEN + (20 * 40) + 26
sta SCREEN + (20 * 40) + 27
sta SCREEN + (20 * 40) + 28
lda difficulty
cmp #DIFF_EASY
beq draw_diff_easy
cmp #DIFF_NORMAL
beq draw_diff_normal
jmp draw_diff_hard
draw_diff_easy:
ldx #0
draw_easy_text:
lda easy_text,x
beq draw_diff_done
sta SCREEN + (20 * 40) + 24,x
lda #EASY_COL
sta COLRAM + (20 * 40) + 24,x
inx
jmp draw_easy_text
draw_diff_normal:
ldx #0
draw_normal_text:
lda normal_text,x
beq draw_diff_done
sta SCREEN + (20 * 40) + 24,x
lda #NORMAL_COL
sta COLRAM + (20 * 40) + 24,x
inx
jmp draw_normal_text
draw_diff_hard:
ldx #0
draw_hard_text:
lda hard_text,x
beq draw_diff_done
sta SCREEN + (20 * 40) + 24,x
lda #HARD_COL
sta COLRAM + (20 * 40) + 24,x
inx
jmp draw_hard_text
draw_diff_done:
rts
easy_text:
!scr "easy"
!byte 0
normal_text:
!scr "normal"
!byte 0
hard_text:
!scr "hard"
!byte 0
; ----------------------------------------------------------------------------
; Draw Practice Mode Section
; ----------------------------------------------------------------------------
draw_practice_mode:
; Draw "PRACTICE:" label
ldx #0
draw_prac_label:
lda prac_label,x
beq draw_prac_label_done
sta SCREEN + (21 * 40) + 12,x
lda #TITLE_COL
sta COLRAM + (21 * 40) + 12,x
inx
jmp draw_prac_label
draw_prac_label_done:
; Draw current state
jsr draw_practice_state
; Draw speed section
ldx #0
draw_speed_label:
lda speed_label,x
beq draw_speed_label_done
sta SCREEN + (22 * 40) + 14,x
lda #TITLE_COL
sta COLRAM + (22 * 40) + 14,x
inx
jmp draw_speed_label
draw_speed_label_done:
jsr draw_speed_state
; Draw endless section
ldx #0
draw_endless_label:
lda endless_label,x
beq draw_endless_label_done
sta SCREEN + (23 * 40) + 13,x
lda #TITLE_COL
sta COLRAM + (23 * 40) + 13,x
inx
jmp draw_endless_label
draw_endless_label_done:
jsr draw_endless_state
rts
prac_label:
!scr "practice:"
!byte 0
speed_label:
!scr "speed:"
!byte 0
endless_label:
!scr "endless:"
!byte 0
; Draw ON/OFF based on practice_mode
draw_practice_state:
lda practice_mode
beq draw_prac_off
; Draw ON
lda #'o'
sta SCREEN + (21 * 40) + 22
lda #'n'
sta SCREEN + (21 * 40) + 23
lda #CHAR_SPACE
sta SCREEN + (21 * 40) + 24
lda #PRACTICE_COL
sta COLRAM + (21 * 40) + 22
sta COLRAM + (21 * 40) + 23
rts
draw_prac_off:
; Draw OFF
lda #'o'
sta SCREEN + (21 * 40) + 22
lda #'f'
sta SCREEN + (21 * 40) + 23
lda #'f'
sta SCREEN + (21 * 40) + 24
lda #SUBTITLE_COL
sta COLRAM + (21 * 40) + 22
sta COLRAM + (21 * 40) + 23
sta COLRAM + (21 * 40) + 24
rts
; Draw speed (0.5x / 0.75x / 1.0x)
draw_speed_state:
; Clear speed area
lda #CHAR_SPACE
sta SCREEN + (22 * 40) + 21
sta SCREEN + (22 * 40) + 22
sta SCREEN + (22 * 40) + 23
sta SCREEN + (22 * 40) + 24
sta SCREEN + (22 * 40) + 25
lda speed_setting
beq draw_speed_half
cmp #1
beq draw_speed_3qrtr
jmp draw_speed_normal
draw_speed_half:
ldx #0
draw_half_text:
lda half_text,x
beq draw_speed_done
sta SCREEN + (22 * 40) + 21,x
lda #EASY_COL ; Green - slowest
sta COLRAM + (22 * 40) + 21,x
inx
jmp draw_half_text
draw_speed_3qrtr:
ldx #0
draw_3qrtr_text:
lda qrtr_text,x
beq draw_speed_done
sta SCREEN + (22 * 40) + 21,x
lda #NORMAL_COL ; Yellow - medium
sta COLRAM + (22 * 40) + 21,x
inx
jmp draw_3qrtr_text
draw_speed_normal:
ldx #0
draw_normal_speed_text:
lda full_text,x
beq draw_speed_done
sta SCREEN + (22 * 40) + 21,x
lda #TITLE_COL ; White - full speed
sta COLRAM + (22 * 40) + 21,x
inx
jmp draw_normal_speed_text
draw_speed_done:
rts
half_text:
!scr "0.5x"
!byte 0
qrtr_text:
!scr "0.75x"
!byte 0
full_text:
!scr "1.0x"
!byte 0
; ----------------------------------------------------------------------------
; Draw Endless Mode State
; ----------------------------------------------------------------------------
draw_endless_state:
lda endless_mode
beq draw_endless_off
; Draw ON in cyan
lda #'o'
sta SCREEN + (23 * 40) + 22
lda #'n'
sta SCREEN + (23 * 40) + 23
lda #CHAR_SPACE
sta SCREEN + (23 * 40) + 24
lda #3 ; Cyan
sta COLRAM + (23 * 40) + 22
sta COLRAM + (23 * 40) + 23
rts
draw_endless_off:
; Draw OFF in grey
lda #'o'
sta SCREEN + (23 * 40) + 22
lda #'f'
sta SCREEN + (23 * 40) + 23
lda #'f'
sta SCREEN + (23 * 40) + 24
lda #SUBTITLE_COL
sta COLRAM + (23 * 40) + 22
sta COLRAM + (23 * 40) + 23
sta COLRAM + (23 * 40) + 24
rts
; ----------------------------------------------------------------------------
; Draw Menu Cursor
; ----------------------------------------------------------------------------
draw_cursor:
; Clear all cursor positions
lda #CHAR_SPACE
sta SCREEN + (8 * 40) + 12
sta SCREEN + (10 * 40) + 12
sta SCREEN + (12 * 40) + 12
sta SCREEN + (14 * 40) + 12
sta SCREEN + (16 * 40) + 12
sta SCREEN + (18 * 40) + 12
; Draw cursor at current position
lda cursor_pos
beq cursor_song1
cmp #1
beq cursor_song2
cmp #2
beq cursor_song3
cmp #3
beq cursor_song4
cmp #4
beq cursor_song5
jmp cursor_song6
cursor_song1:
lda #CHAR_CURSOR
sta SCREEN + (8 * 40) + 12
lda #CURSOR_COL
sta COLRAM + (8 * 40) + 12
rts
cursor_song2:
lda #CHAR_CURSOR
sta SCREEN + (10 * 40) + 12
lda #CURSOR_COL
sta COLRAM + (10 * 40) + 12
rts
cursor_song3:
lda #CHAR_CURSOR
sta SCREEN + (12 * 40) + 12
lda #CURSOR_COL
sta COLRAM + (12 * 40) + 12
rts
cursor_song4:
lda #CHAR_CURSOR
sta SCREEN + (14 * 40) + 12
lda #CURSOR_COL
sta COLRAM + (14 * 40) + 12
rts
cursor_song5:
lda #CHAR_CURSOR
sta SCREEN + (16 * 40) + 12
lda #CURSOR_COL
sta COLRAM + (16 * 40) + 12
rts
cursor_song6:
lda #CHAR_CURSOR
sta SCREEN + (18 * 40) + 12
lda #CURSOR_COL
sta COLRAM + (18 * 40) + 12
rts
; ----------------------------------------------------------------------------
; Update Menu State
; ----------------------------------------------------------------------------
update_menu:
; Handle key delay
lda key_delay_count
beq menu_check_input
dec key_delay_count
jmp menu_check_fire
menu_check_input:
; Check joystick up
lda CIA1_PRA
and #$01 ; Bit 0 = up
beq menu_up_pressed
; Check joystick down
lda CIA1_PRA
and #$02 ; Bit 1 = down
beq menu_down_pressed
; Check joystick left (difficulty)
lda CIA1_PRA
and #$04 ; Bit 2 = left
beq menu_left_pressed
; Check joystick right (difficulty)
lda CIA1_PRA
and #$08 ; Bit 3 = right
beq menu_right_pressed
jmp menu_check_fire
menu_up_pressed:
lda cursor_pos
beq menu_set_delay ; Already at top
dec cursor_pos
jsr play_menu_move
jsr draw_cursor
jmp menu_set_delay
menu_down_pressed:
lda cursor_pos
cmp #NUM_SONGS-1
bcs menu_set_delay ; Already at bottom
inc cursor_pos
jsr play_menu_move
jsr draw_cursor
jmp menu_set_delay
menu_left_pressed:
lda difficulty
beq menu_set_delay ; Already at Easy
dec difficulty
jsr play_menu_move
jsr draw_current_difficulty
jmp menu_set_delay
menu_right_pressed:
lda difficulty
cmp #DIFF_HARD
bcs menu_set_delay ; Already at Hard
inc difficulty
jsr play_menu_move
jsr draw_current_difficulty
jmp menu_set_delay
menu_set_delay:
lda #KEY_DELAY
sta key_delay_count
menu_check_keys:
; Check P key for practice toggle (row 1, column 5)
lda #$FD ; Row 1
sta CIA1_PRA
lda CIA1_PRB
and #$20 ; Column 5 = P
beq menu_p_pressed
; Check + key (row 0, column 0 = plus on keyboard)
lda #$FE ; Row 0
sta CIA1_PRA
lda CIA1_PRB
and #$01 ; Column 0 = +
beq menu_plus_pressed
; Check - key (row 5, column 3)
lda #$DF ; Row 5
sta CIA1_PRA
lda CIA1_PRB
and #$08 ; Column 3 = -
beq menu_minus_pressed
; Check E key for endless toggle (row 1, column 6)
lda #$FD ; Row 1
sta CIA1_PRA
lda CIA1_PRB
and #$40 ; Column 6 = E
beq menu_e_pressed
jmp menu_check_fire
menu_e_pressed:
; Toggle endless mode
lda endless_mode
eor #1
sta endless_mode
jsr play_menu_move
jsr draw_endless_state
lda #KEY_DELAY
sta key_delay_count
jmp menu_check_fire
menu_p_pressed:
; Toggle practice mode
lda practice_mode
eor #1
sta practice_mode
jsr play_menu_move
jsr draw_practice_state
lda #KEY_DELAY
sta key_delay_count
jmp menu_check_fire
menu_plus_pressed:
; Increase speed (towards 1.0x)
lda speed_setting
cmp #NUM_SPEEDS-1
bcs menu_check_fire ; Already at max
inc speed_setting
jsr play_menu_move
jsr draw_speed_state
lda #KEY_DELAY
sta key_delay_count
jmp menu_check_fire
menu_minus_pressed:
; Decrease speed (towards 0.5x)
lda speed_setting
beq menu_check_fire ; Already at min
dec speed_setting
jsr play_menu_move
jsr draw_speed_state
lda #KEY_DELAY
sta key_delay_count
menu_check_fire:
; Check for fire button
lda CIA1_PRA
and #$10
beq menu_fire_pressed
; Check space bar
lda #$7F
sta CIA1_PRA
lda CIA1_PRB
and #$10
beq menu_fire_pressed
lda #$FF
sta CIA1_PRA
rts
menu_fire_pressed:
lda #$FF
sta CIA1_PRA
; Play select sound
jsr play_menu_select
; Store selected song
lda cursor_pos
sta selected_song
; Set difficulty parameters
jsr set_difficulty_params
; Transition to game
jsr transition_to_game
rts
; ----------------------------------------------------------------------------
; Set Difficulty Parameters
; ----------------------------------------------------------------------------
set_difficulty_params:
lda difficulty
cmp #DIFF_EASY
beq set_diff_easy
cmp #DIFF_NORMAL
beq set_diff_normal
jmp set_diff_hard
set_diff_easy:
lda #PERFECT_WINDOW_EASY
sta perfect_window
lda #GOOD_WINDOW_EASY
sta good_window
lda #HEALTH_MISS_EASY
sta health_miss_amt
rts
set_diff_normal:
lda #PERFECT_WINDOW_NORMAL
sta perfect_window
lda #GOOD_WINDOW_NORMAL
sta good_window
lda #HEALTH_MISS_NORMAL
sta health_miss_amt
rts
set_diff_hard:
lda #PERFECT_WINDOW_HARD
sta perfect_window
lda #GOOD_WINDOW_HARD
sta good_window
lda #HEALTH_MISS_HARD
sta health_miss_amt
rts
; ----------------------------------------------------------------------------
; Transition to Game
; ----------------------------------------------------------------------------
transition_to_game:
; Set up tempo based on song selection
lda selected_song
beq setup_song1
cmp #1
beq setup_song2
cmp #2
bne +
jmp setup_song3
+ cmp #3
bne ++
jmp setup_song4
++ cmp #4
bne +++
jmp setup_song5
+++ jmp setup_song6
setup_song1:
lda #TEMPO_SONG1
sta frames_per_beat
lda #LENGTH_SONG1
sta song_length
; Select difficulty variant for Song 1
lda difficulty
cmp #DIFF_EASY
beq load_s1_easy
cmp #DIFF_NORMAL
beq load_s1_normal
jmp load_s1_hard
load_s1_easy:
lda #<song1_easy
sta song_data_ptr
lda #>song1_easy
sta song_data_ptr+1
jmp start_game
load_s1_normal:
lda #<song1_normal
sta song_data_ptr
lda #>song1_normal
sta song_data_ptr+1
jmp start_game
load_s1_hard:
lda #<song1_hard
sta song_data_ptr
lda #>song1_hard
sta song_data_ptr+1
jmp start_game
setup_song2:
lda #TEMPO_SONG2
sta frames_per_beat
lda #LENGTH_SONG2
sta song_length
; Select difficulty variant for Song 2
lda difficulty
cmp #DIFF_EASY
beq load_s2_easy
cmp #DIFF_NORMAL
beq load_s2_normal
jmp load_s2_hard
load_s2_easy:
lda #<song2_easy
sta song_data_ptr
lda #>song2_easy
sta song_data_ptr+1
jmp start_game
load_s2_normal:
lda #<song2_normal
sta song_data_ptr
lda #>song2_normal
sta song_data_ptr+1
jmp start_game
load_s2_hard:
lda #<song2_hard
sta song_data_ptr
lda #>song2_hard
sta song_data_ptr+1
jmp start_game
setup_song3:
lda #TEMPO_SONG3
sta frames_per_beat
lda #LENGTH_SONG3
sta song_length
; Select difficulty variant for Song 3
lda difficulty
cmp #DIFF_EASY
beq load_s3_easy
cmp #DIFF_NORMAL
beq load_s3_normal
jmp load_s3_hard
load_s3_easy:
lda #<song3_easy
sta song_data_ptr
lda #>song3_easy
sta song_data_ptr+1
jmp start_game
load_s3_normal:
lda #<song3_normal
sta song_data_ptr
lda #>song3_normal
sta song_data_ptr+1
jmp start_game
load_s3_hard:
lda #<song3_hard
sta song_data_ptr
lda #>song3_hard
sta song_data_ptr+1
jmp start_game
setup_song4:
lda #TEMPO_SONG4
sta frames_per_beat
lda #LENGTH_SONG4
sta song_length
; Select difficulty variant for Song 4
lda difficulty
cmp #DIFF_EASY
beq load_s4_easy
cmp #DIFF_NORMAL
beq load_s4_normal
jmp load_s4_hard
load_s4_easy:
lda #<song4_easy
sta song_data_ptr
lda #>song4_easy
sta song_data_ptr+1
jmp start_game
load_s4_normal:
lda #<song4_normal
sta song_data_ptr
lda #>song4_normal
sta song_data_ptr+1
jmp start_game
load_s4_hard:
lda #<song4_hard
sta song_data_ptr
lda #>song4_hard
sta song_data_ptr+1
jmp start_game
setup_song5:
lda #TEMPO_SONG5
sta frames_per_beat
lda #LENGTH_SONG5
sta song_length
; Select difficulty variant for Song 5
lda difficulty
cmp #DIFF_EASY
beq load_s5_easy
cmp #DIFF_NORMAL
beq load_s5_normal
jmp load_s5_hard
load_s5_easy:
lda #<song5_easy
sta song_data_ptr
lda #>song5_easy
sta song_data_ptr+1
jmp start_game
load_s5_normal:
lda #<song5_normal
sta song_data_ptr
lda #>song5_normal
sta song_data_ptr+1
jmp start_game
load_s5_hard:
lda #<song5_hard
sta song_data_ptr
lda #>song5_hard
sta song_data_ptr+1
jmp start_game
setup_song6:
lda #TEMPO_SONG6
sta frames_per_beat
lda #LENGTH_SONG6
sta song_length
; Select difficulty variant for Song 6
lda difficulty
cmp #DIFF_EASY
beq load_s6_easy
cmp #DIFF_NORMAL
beq load_s6_normal
jmp load_s6_hard
load_s6_easy:
lda #<song6_easy
sta song_data_ptr
lda #>song6_easy
sta song_data_ptr+1
jmp start_game
load_s6_normal:
lda #<song6_normal
sta song_data_ptr
lda #>song6_normal
sta song_data_ptr+1
jmp start_game
load_s6_hard:
lda #<song6_hard
sta song_data_ptr
lda #>song6_hard
sta song_data_ptr+1
start_game:
; Apply speed modifier to tempo
jsr apply_speed_modifier
; Initialise game
jsr init_game
lda #STATE_PLAYING
sta game_state
rts
; Apply speed modifier to frames_per_beat
apply_speed_modifier:
lda speed_setting
beq speed_half_tempo ; 0 = 0.5x
cmp #1
beq speed_3qrtr_tempo ; 1 = 0.75x
rts ; 2 = 1.0x, no change
speed_half_tempo:
; 0.5x speed = double frames_per_beat
asl frames_per_beat
rts
speed_3qrtr_tempo:
; 0.75x speed = frames_per_beat + frames_per_beat/3
; Approximation: add half (will be roughly 1.5x, close to 0.75x)
lda frames_per_beat
lsr ; Divide by 2
clc
adc frames_per_beat ; Add to original = 1.5x frames
sta frames_per_beat
rts
; Song data pointers
song_data_ptr:
!word 0
; ----------------------------------------------------------------------------
; Play Menu Move Sound
; ----------------------------------------------------------------------------
play_menu_move:
lda #0
sta SID_V3_FREQ_LO
lda #MENU_MOVE_FREQ
sta SID_V3_FREQ_HI
lda #$08
sta SID_V3_PWHI
lda #MENU_MOVE_AD
sta SID_V3_AD
lda #MENU_MOVE_SR
sta SID_V3_SR
lda #MENU_MOVE_WAVE
ora #$01 ; Gate on
sta SID_V3_CTRL
rts
; ----------------------------------------------------------------------------
; Play Menu Select Sound
; ----------------------------------------------------------------------------
play_menu_select:
lda #0
sta SID_V3_FREQ_LO
lda #MENU_SELECT_FREQ
sta SID_V3_FREQ_HI
lda #$08
sta SID_V3_PWHI
lda #MENU_SELECT_AD
sta SID_V3_AD
lda #MENU_SELECT_SR
sta SID_V3_SR
lda #MENU_SELECT_WAVE
ora #$01 ; Gate on
sta SID_V3_CTRL
rts
; ----------------------------------------------------------------------------
; Initialize Game
; ----------------------------------------------------------------------------
init_game:
jsr init_screen
jsr init_notes
jsr init_score
jsr init_health
jsr init_combo
jsr init_song
; Initialize visual effect variables
lda #0
sta bg_flash
sta beat_pulse
; Initialize advanced scoring variables
sta perfect_streak
sta best_streak
sta section_bonus
sta notes_hit
; Initialize endless mode loop counter
lda #1 ; Start at loop 1
sta loop_count
; Display loop count if in endless mode
lda endless_mode
beq init_game_done
jsr display_loop_count
init_game_done:
rts
; ----------------------------------------------------------------------------
; Initialize Combo
; ----------------------------------------------------------------------------
init_combo:
lda #0
sta combo
sta max_combo
jsr display_combo
rts
; ----------------------------------------------------------------------------
; Update Playing State
; ----------------------------------------------------------------------------
update_playing:
inc frame_count
lda frame_count
cmp frames_per_beat
bcc no_new_beat
lda #0
sta frame_count
jsr advance_song
jsr check_section_bonus ; Check for section completion bonus
jsr check_spawn_note
; Trigger beat pulse on every new beat
lda #8 ; Pulse duration (frames)
sta beat_pulse
no_new_beat:
jsr update_notes
jsr reset_track_colours
jsr update_border_flash
jsr check_keys
jsr check_song_end
rts
; ----------------------------------------------------------------------------
; Update Results State
; ----------------------------------------------------------------------------
update_results:
; Check for fire to return to menu
lda CIA1_PRA
and #$10
beq results_fire
; Also check space bar
lda #$7F
sta CIA1_PRA
lda CIA1_PRB
and #$10
beq results_fire
lda #$FF
sta CIA1_PRA
rts
results_fire:
lda #$FF
sta CIA1_PRA
jsr play_menu_select
; Return to menu
jsr show_menu
lda #STATE_MENU
sta game_state
rts
; ----------------------------------------------------------------------------
; Update Game Over State
; ----------------------------------------------------------------------------
update_gameover:
; Check for fire to return to menu
lda CIA1_PRA
and #$10
beq gameover_fire
; Also check space bar
lda #$7F
sta CIA1_PRA
lda CIA1_PRB
and #$10
beq gameover_fire
lda #$FF
sta CIA1_PRA
rts
gameover_fire:
lda #$FF
sta CIA1_PRA
jsr play_menu_select
; Return to menu
jsr show_menu
lda #STATE_MENU
sta game_state
rts
; ----------------------------------------------------------------------------
; Initialize Screen (Gameplay)
; ----------------------------------------------------------------------------
init_screen:
; Enable custom charset
lda #$1C ; Character ROM at $3000
sta CHARPTR
; Set colours
lda #BORDER_COL
sta BORDER
lda #BG_COL
sta BGCOL
; Clear screen
ldx #0
lda #CHAR_SPACE
clear_screen:
sta SCREEN,x
sta SCREEN+$100,x
sta SCREEN+$200,x
sta SCREEN+$2E8,x
inx
bne clear_screen
; Draw tracks
ldx #0
draw_tracks:
lda #CHAR_TRACK
sta SCREEN + (TRACK1_ROW * 40),x
sta SCREEN + (TRACK2_ROW * 40),x
sta SCREEN + (TRACK3_ROW * 40),x
lda #TRACK_LINE_COL
sta COLRAM + (TRACK1_ROW * 40),x
sta COLRAM + (TRACK2_ROW * 40),x
sta COLRAM + (TRACK3_ROW * 40),x
inx
cpx #38
bne draw_tracks
; Draw hit zones
lda #CHAR_HITZONE
sta SCREEN + (TRACK1_ROW * 40) + HIT_ZONE_COLUMN
sta SCREEN + (TRACK2_ROW * 40) + HIT_ZONE_COLUMN
sta SCREEN + (TRACK3_ROW * 40) + HIT_ZONE_COLUMN
lda #HIT_ZONE_COL
sta COLRAM + (TRACK1_ROW * 40) + HIT_ZONE_COLUMN
sta COLRAM + (TRACK2_ROW * 40) + HIT_ZONE_COLUMN
sta COLRAM + (TRACK3_ROW * 40) + HIT_ZONE_COLUMN
; Draw track labels
lda #$31 ; "1"
sta SCREEN + (TRACK1_ROW * 40)
lda #$32 ; "2"
sta SCREEN + (TRACK2_ROW * 40)
lda #$33 ; "3"
sta SCREEN + (TRACK3_ROW * 40)
lda #1
sta COLRAM + (TRACK1_ROW * 40)
sta COLRAM + (TRACK2_ROW * 40)
sta COLRAM + (TRACK3_ROW * 40)
; Draw HUD labels
ldx #0
draw_score_label:
lda score_label,x
beq draw_miss_label_start
sta SCREEN,x
lda #7
sta COLRAM,x
inx
jmp draw_score_label
draw_miss_label_start:
ldx #0
draw_miss_label:
lda miss_label,x
beq draw_combo_label_start
sta SCREEN + 14,x
lda #2
sta COLRAM + 14,x
inx
jmp draw_miss_label
draw_combo_label_start:
ldx #0
draw_combo_label:
lda combo_label,x
beq draw_health_label_start
sta SCREEN + (COMBO_ROW * 40) + 27,x
lda #COMBO_COL
sta COLRAM + (COMBO_ROW * 40) + 27,x
inx
jmp draw_combo_label
draw_health_label_start:
ldx #0
draw_health_label:
lda health_label,x
beq draw_progress_label_start
sta SCREEN + (HEALTH_ROW * 40),x
lda #HEALTH_COL
sta COLRAM + (HEALTH_ROW * 40),x
inx
jmp draw_health_label
draw_progress_label_start:
ldx #0
draw_progress_label:
lda progress_label,x
beq labels_done
sta SCREEN + (PROGRESS_ROW * 40),x
lda #PROGRESS_COL
sta COLRAM + (PROGRESS_ROW * 40),x
inx
jmp draw_progress_label
labels_done:
; Draw song name based on selection
lda selected_song
beq draw_name_song1
jmp draw_name_song2
draw_name_song1:
ldx #0
draw_sn1:
lda song1_name,x
beq draw_difficulty_hud
sta SCREEN + 28,x
lda #11
sta COLRAM + 28,x
inx
jmp draw_sn1
draw_name_song2:
ldx #0
draw_sn2:
lda song2_name,x
beq draw_difficulty_hud
sta SCREEN + 26,x
lda #11
sta COLRAM + 26,x
inx
jmp draw_sn2
draw_difficulty_hud:
; Show difficulty on gameplay HUD
lda difficulty
cmp #DIFF_EASY
beq draw_hud_easy
cmp #DIFF_NORMAL
beq draw_hud_normal
jmp draw_hud_hard
draw_hud_easy:
ldx #0
draw_hud_e:
lda easy_text,x
beq draw_song_name_done
sta SCREEN + (COMBO_ROW * 40),x
lda #EASY_COL
sta COLRAM + (COMBO_ROW * 40),x
inx
jmp draw_hud_e
draw_hud_normal:
ldx #0
draw_hud_n:
lda normal_text,x
beq draw_song_name_done
sta SCREEN + (COMBO_ROW * 40),x
lda #NORMAL_COL
sta COLRAM + (COMBO_ROW * 40),x
inx
jmp draw_hud_n
draw_hud_hard:
ldx #0
draw_hud_h:
lda hard_text,x
beq draw_song_name_done
sta SCREEN + (COMBO_ROW * 40),x
lda #HARD_COL
sta COLRAM + (COMBO_ROW * 40),x
inx
jmp draw_hud_h
draw_song_name_done:
rts
score_label:
!scr "score:"
!byte 0
miss_label:
!scr "miss:"
!byte 0
combo_label:
!scr "combo:"
!byte 0
health_label:
!scr "health:"
!byte 0
progress_label:
!scr "song:"
!byte 0
; ----------------------------------------------------------------------------
; Initialize Notes
; ----------------------------------------------------------------------------
init_notes:
ldx #0
lda #0
clear_notes:
sta note_track,x
sta note_col,x
sta note_freq,x
inx
cpx #MAX_NOTES
bne clear_notes
rts
; ----------------------------------------------------------------------------
; Initialize Score
; ----------------------------------------------------------------------------
init_score:
lda #0
sta score_lo
sta score_hi
sta miss_count
sta perfect_count
sta good_count
jsr display_score
jsr display_misses
rts
; ----------------------------------------------------------------------------
; Initialize Health
; ----------------------------------------------------------------------------
init_health:
lda #HEALTH_START
sta health
jsr display_health
rts
; ----------------------------------------------------------------------------
; Initialize Song
; ----------------------------------------------------------------------------
init_song:
lda #0
sta frame_count
sta beat_count
sta song_beat
sta song_ended
; Point to selected song data
lda song_data_ptr
sta song_pos
lda song_data_ptr+1
sta song_pos_hi
jsr display_progress
rts
; ----------------------------------------------------------------------------
; Initialize SID
; ----------------------------------------------------------------------------
init_sid:
; Clear SID
ldx #$18
lda #0
clear_sid:
sta SID,x
dex
bpl clear_sid
; Set volume
lda #$0F
sta SID_VOLUME
; Set pulse widths
lda #PULSE_WIDTH
sta SID_V1_PWHI
sta SID_V2_PWHI
sta SID_V3_PWHI
; Set ADSR for all voices
lda #VOICE_AD
sta SID_V1_AD
sta SID_V2_AD
sta SID_V3_AD
lda #VOICE_SR
sta SID_V1_SR
sta SID_V2_SR
sta SID_V3_SR
rts
; ----------------------------------------------------------------------------
; Copy Custom Charset
; ----------------------------------------------------------------------------
copy_charset:
; Copy default ROM charset to RAM first
sei
lda #$33
sta $01
ldx #0
copy_rom_chars:
lda $D000,x
sta CHARSET,x
lda $D100,x
sta CHARSET+$100,x
lda $D200,x
sta CHARSET+$200,x
lda $D300,x
sta CHARSET+$300,x
lda $D400,x
sta CHARSET+$400,x
lda $D500,x
sta CHARSET+$500,x
lda $D600,x
sta CHARSET+$600,x
lda $D700,x
sta CHARSET+$700,x
inx
bne copy_rom_chars
lda #$37
sta $01
cli
; Now add custom characters
; Character 128 - Note (solid circle)
lda #%00111100
sta CHARSET + (128 * 8) + 0
lda #%01111110
sta CHARSET + (128 * 8) + 1
lda #%11111111
sta CHARSET + (128 * 8) + 2
lda #%11111111
sta CHARSET + (128 * 8) + 3
lda #%11111111
sta CHARSET + (128 * 8) + 4
lda #%11111111
sta CHARSET + (128 * 8) + 5
lda #%01111110
sta CHARSET + (128 * 8) + 6
lda #%00111100
sta CHARSET + (128 * 8) + 7
; Character 129 - Track line (dashes)
lda #%00000000
sta CHARSET + (129 * 8) + 0
lda #%00000000
sta CHARSET + (129 * 8) + 1
lda #%00000000
sta CHARSET + (129 * 8) + 2
lda #%11001100
sta CHARSET + (129 * 8) + 3
lda #%11001100
sta CHARSET + (129 * 8) + 4
lda #%00000000
sta CHARSET + (129 * 8) + 5
lda #%00000000
sta CHARSET + (129 * 8) + 6
lda #%00000000
sta CHARSET + (129 * 8) + 7
; Character 130 - Hit zone (vertical bars)
lda #%10000001
sta CHARSET + (130 * 8) + 0
lda #%10000001
sta CHARSET + (130 * 8) + 1
lda #%10000001
sta CHARSET + (130 * 8) + 2
lda #%10000001
sta CHARSET + (130 * 8) + 3
lda #%10000001
sta CHARSET + (130 * 8) + 4
lda #%10000001
sta CHARSET + (130 * 8) + 5
lda #%10000001
sta CHARSET + (130 * 8) + 6
lda #%10000001
sta CHARSET + (130 * 8) + 7
; Character 131 - Bar full (solid block)
lda #%11111111
sta CHARSET + (131 * 8) + 0
sta CHARSET + (131 * 8) + 1
sta CHARSET + (131 * 8) + 2
sta CHARSET + (131 * 8) + 3
sta CHARSET + (131 * 8) + 4
sta CHARSET + (131 * 8) + 5
sta CHARSET + (131 * 8) + 6
sta CHARSET + (131 * 8) + 7
; Character 132 - Bar empty (hollow block)
lda #%11111111
sta CHARSET + (132 * 8) + 0
lda #%10000001
sta CHARSET + (132 * 8) + 1
sta CHARSET + (132 * 8) + 2
sta CHARSET + (132 * 8) + 3
sta CHARSET + (132 * 8) + 4
sta CHARSET + (132 * 8) + 5
sta CHARSET + (132 * 8) + 6
lda #%11111111
sta CHARSET + (132 * 8) + 7
; ----------------------------------------
; Logo characters for title screen
; ----------------------------------------
; Character 133 - Top-left corner
lda #%11111111
sta CHARSET + (133 * 8) + 0
sta CHARSET + (133 * 8) + 1
lda #%11000000
sta CHARSET + (133 * 8) + 2
sta CHARSET + (133 * 8) + 3
sta CHARSET + (133 * 8) + 4
sta CHARSET + (133 * 8) + 5
sta CHARSET + (133 * 8) + 6
sta CHARSET + (133 * 8) + 7
; Character 134 - Top-right corner
lda #%11111111
sta CHARSET + (134 * 8) + 0
sta CHARSET + (134 * 8) + 1
lda #%00000011
sta CHARSET + (134 * 8) + 2
sta CHARSET + (134 * 8) + 3
sta CHARSET + (134 * 8) + 4
sta CHARSET + (134 * 8) + 5
sta CHARSET + (134 * 8) + 6
sta CHARSET + (134 * 8) + 7
; Character 135 - Bottom-left corner
lda #%11000000
sta CHARSET + (135 * 8) + 0
sta CHARSET + (135 * 8) + 1
sta CHARSET + (135 * 8) + 2
sta CHARSET + (135 * 8) + 3
sta CHARSET + (135 * 8) + 4
sta CHARSET + (135 * 8) + 5
lda #%11111111
sta CHARSET + (135 * 8) + 6
sta CHARSET + (135 * 8) + 7
; Character 136 - Bottom-right corner
lda #%00000011
sta CHARSET + (136 * 8) + 0
sta CHARSET + (136 * 8) + 1
sta CHARSET + (136 * 8) + 2
sta CHARSET + (136 * 8) + 3
sta CHARSET + (136 * 8) + 4
sta CHARSET + (136 * 8) + 5
lda #%11111111
sta CHARSET + (136 * 8) + 6
sta CHARSET + (136 * 8) + 7
; Character 137 - Horizontal bar (top/bottom)
lda #%11111111
sta CHARSET + (137 * 8) + 0
sta CHARSET + (137 * 8) + 1
lda #%00000000
sta CHARSET + (137 * 8) + 2
sta CHARSET + (137 * 8) + 3
sta CHARSET + (137 * 8) + 4
sta CHARSET + (137 * 8) + 5
lda #%11111111
sta CHARSET + (137 * 8) + 6
sta CHARSET + (137 * 8) + 7
; Character 138 - Vertical bar (left/right side)
lda #%11000011
sta CHARSET + (138 * 8) + 0
sta CHARSET + (138 * 8) + 1
sta CHARSET + (138 * 8) + 2
sta CHARSET + (138 * 8) + 3
sta CHARSET + (138 * 8) + 4
sta CHARSET + (138 * 8) + 5
sta CHARSET + (138 * 8) + 6
sta CHARSET + (138 * 8) + 7
; Character 139 - Full block (for logo fill)
lda #%11111111
sta CHARSET + (139 * 8) + 0
sta CHARSET + (139 * 8) + 1
sta CHARSET + (139 * 8) + 2
sta CHARSET + (139 * 8) + 3
sta CHARSET + (139 * 8) + 4
sta CHARSET + (139 * 8) + 5
sta CHARSET + (139 * 8) + 6
sta CHARSET + (139 * 8) + 7
; Character 140 - Half block top
lda #%11111111
sta CHARSET + (140 * 8) + 0
sta CHARSET + (140 * 8) + 1
sta CHARSET + (140 * 8) + 2
sta CHARSET + (140 * 8) + 3
lda #%00000000
sta CHARSET + (140 * 8) + 4
sta CHARSET + (140 * 8) + 5
sta CHARSET + (140 * 8) + 6
sta CHARSET + (140 * 8) + 7
; Character 141 - Half block bottom
lda #%00000000
sta CHARSET + (141 * 8) + 0
sta CHARSET + (141 * 8) + 1
sta CHARSET + (141 * 8) + 2
sta CHARSET + (141 * 8) + 3
lda #%11111111
sta CHARSET + (141 * 8) + 4
sta CHARSET + (141 * 8) + 5
sta CHARSET + (141 * 8) + 6
sta CHARSET + (141 * 8) + 7
; Character 142 - Centre dot (decorative)
lda #%00000000
sta CHARSET + (142 * 8) + 0
sta CHARSET + (142 * 8) + 1
lda #%00011000
sta CHARSET + (142 * 8) + 2
lda #%00111100
sta CHARSET + (142 * 8) + 3
sta CHARSET + (142 * 8) + 4
lda #%00011000
sta CHARSET + (142 * 8) + 5
lda #%00000000
sta CHARSET + (142 * 8) + 6
sta CHARSET + (142 * 8) + 7
rts
; ----------------------------------------------------------------------------
; Advance Song
; ----------------------------------------------------------------------------
advance_song:
inc song_beat
jsr display_progress
rts
; ----------------------------------------------------------------------------
; Check Spawn Note
; ----------------------------------------------------------------------------
check_spawn_note:
; Check if song has ended
lda song_ended
bne spawn_done
; Get pointer to current position in song
lda song_pos
sta ZP_PTR
lda song_pos_hi
sta ZP_PTR_HI
; Read beat number
ldy #0
lda (ZP_PTR),y
; Check for end marker
cmp #$FF
beq song_end_marker
; Check if this beat matches
cmp song_beat
bne spawn_done
; Spawn this note
iny
lda (ZP_PTR),y ; Track
sta temp_track
iny
lda (ZP_PTR),y ; Frequency
; Find free note slot
ldx #0
find_slot:
lda note_track,x
beq found_slot
inx
cpx #MAX_NOTES
bne find_slot
jmp advance_song_ptr ; No free slot, skip note
found_slot:
lda temp_track
sta note_track,x
lda #NOTE_SPAWN_COL
sta note_col,x
ldy #2
lda (ZP_PTR),y
sta note_freq,x
jsr draw_note
advance_song_ptr:
; Move to next note in song
lda song_pos
clc
adc #3
sta song_pos
lda song_pos_hi
adc #0
sta song_pos_hi
; Check if there are more notes on this beat
jmp check_spawn_note
song_end_marker:
lda #1
sta song_ended
spawn_done:
rts
; ----------------------------------------------------------------------------
; Update Notes
; ----------------------------------------------------------------------------
update_notes:
ldx #0
update_notes_loop:
lda note_track,x
beq update_next_note
; Erase at old position
jsr erase_note
; Move note left
dec note_col,x
; Check if past hit zone (missed)
lda note_col,x
cmp #HIT_ZONE_START
bcs note_still_active
; Note was missed
lda note_track,x
sta miss_track
lda #0
sta note_track,x
jsr handle_miss
jmp update_next_note
note_still_active:
jsr draw_note
update_next_note:
inx
cpx #MAX_NOTES
bne update_notes_loop
rts
; ----------------------------------------------------------------------------
; Draw Note
; ----------------------------------------------------------------------------
draw_note:
lda note_track,x
cmp #1
beq draw_note_t1
cmp #2
beq draw_note_t2
jmp draw_note_t3
draw_note_t1:
lda note_col,x
clc
adc #<(SCREEN + TRACK1_ROW * 40)
sta ZP_PTR
lda #>(SCREEN + TRACK1_ROW * 40)
adc #0
sta ZP_PTR_HI
lda #CHAR_NOTE
ldy #0
sta (ZP_PTR),y
; Set colour
lda note_col,x
clc
adc #<(COLRAM + TRACK1_ROW * 40)
sta ZP_PTR
lda #>(COLRAM + TRACK1_ROW * 40)
adc #0
sta ZP_PTR_HI
lda #TRACK1_NOTE_COL
sta (ZP_PTR),y
rts
draw_note_t2:
lda note_col,x
clc
adc #<(SCREEN + TRACK2_ROW * 40)
sta ZP_PTR
lda #>(SCREEN + TRACK2_ROW * 40)
adc #0
sta ZP_PTR_HI
lda #CHAR_NOTE
ldy #0
sta (ZP_PTR),y
lda note_col,x
clc
adc #<(COLRAM + TRACK2_ROW * 40)
sta ZP_PTR
lda #>(COLRAM + TRACK2_ROW * 40)
adc #0
sta ZP_PTR_HI
lda #TRACK2_NOTE_COL
sta (ZP_PTR),y
rts
draw_note_t3:
lda note_col,x
clc
adc #<(SCREEN + TRACK3_ROW * 40)
sta ZP_PTR
lda #>(SCREEN + TRACK3_ROW * 40)
adc #0
sta ZP_PTR_HI
lda #CHAR_NOTE
ldy #0
sta (ZP_PTR),y
lda note_col,x
clc
adc #<(COLRAM + TRACK3_ROW * 40)
sta ZP_PTR
lda #>(COLRAM + TRACK3_ROW * 40)
adc #0
sta ZP_PTR_HI
lda #TRACK3_NOTE_COL
sta (ZP_PTR),y
rts
; ----------------------------------------------------------------------------
; Erase Note
; ----------------------------------------------------------------------------
erase_note:
lda note_track,x
cmp #1
beq erase_note_t1
cmp #2
beq erase_note_t2
jmp erase_note_t3
erase_note_t1:
lda note_col,x
clc
adc #<(SCREEN + TRACK1_ROW * 40)
sta ZP_PTR
lda #>(SCREEN + TRACK1_ROW * 40)
adc #0
sta ZP_PTR_HI
lda #CHAR_TRACK
ldy #0
sta (ZP_PTR),y
lda note_col,x
clc
adc #<(COLRAM + TRACK1_ROW * 40)
sta ZP_PTR
lda #>(COLRAM + TRACK1_ROW * 40)
adc #0
sta ZP_PTR_HI
lda #TRACK_LINE_COL
sta (ZP_PTR),y
rts
erase_note_t2:
lda note_col,x
clc
adc #<(SCREEN + TRACK2_ROW * 40)
sta ZP_PTR
lda #>(SCREEN + TRACK2_ROW * 40)
adc #0
sta ZP_PTR_HI
lda #CHAR_TRACK
ldy #0
sta (ZP_PTR),y
lda note_col,x
clc
adc #<(COLRAM + TRACK2_ROW * 40)
sta ZP_PTR
lda #>(COLRAM + TRACK2_ROW * 40)
adc #0
sta ZP_PTR_HI
lda #TRACK_LINE_COL
sta (ZP_PTR),y
rts
erase_note_t3:
lda note_col,x
clc
adc #<(SCREEN + TRACK3_ROW * 40)
sta ZP_PTR
lda #>(SCREEN + TRACK3_ROW * 40)
adc #0
sta ZP_PTR_HI
lda #CHAR_TRACK
ldy #0
sta (ZP_PTR),y
lda note_col,x
clc
adc #<(COLRAM + TRACK3_ROW * 40)
sta ZP_PTR
lda #>(COLRAM + TRACK3_ROW * 40)
adc #0
sta ZP_PTR_HI
lda #TRACK_LINE_COL
sta (ZP_PTR),y
rts
; ----------------------------------------------------------------------------
; Handle Miss
; ----------------------------------------------------------------------------
handle_miss:
jsr play_miss_sound
jsr break_combo
; In practice mode, don't decrease health
lda practice_mode
bne skip_health_loss
; Decrease health (using difficulty-adjusted amount)
lda health_miss_amt
jsr decrease_health
skip_health_loss:
; Flash border red
lda #MISS_COL
sta BORDER
lda #8
sta border_flash
; Flash the track where miss happened
lda miss_track
cmp #1
beq flash_miss_t1
cmp #2
beq flash_miss_t2
jmp flash_miss_t3
flash_miss_t1:
ldx #0
lda #MISS_COL
flash_m1_loop:
sta COLRAM + (TRACK1_ROW * 40),x
inx
cpx #38
bne flash_m1_loop
rts
flash_miss_t2:
ldx #0
lda #MISS_COL
flash_m2_loop:
sta COLRAM + (TRACK2_ROW * 40),x
inx
cpx #38
bne flash_m2_loop
rts
flash_miss_t3:
ldx #0
lda #MISS_COL
flash_m3_loop:
sta COLRAM + (TRACK3_ROW * 40),x
inx
cpx #38
bne flash_m3_loop
rts
; ----------------------------------------------------------------------------
; Play Miss Sound
; ----------------------------------------------------------------------------
play_miss_sound:
inc miss_count
jsr display_misses
lda #0
sta SID_V3_FREQ_LO
lda #MISS_FREQ
sta SID_V3_FREQ_HI
lda #MISS_AD
sta SID_V3_AD
lda #MISS_SR
sta SID_V3_SR
lda #MISS_WAVE
ora #$01
sta SID_V3_CTRL
rts
; ----------------------------------------------------------------------------
; Play Perfect Sound
; ----------------------------------------------------------------------------
play_perfect_sound:
lda #0
sta SID_V3_FREQ_LO
lda #PERFECT_SFX_FREQ
sta SID_V3_FREQ_HI
lda #PERFECT_SFX_AD
sta SID_V3_AD
lda #PERFECT_SFX_SR
sta SID_V3_SR
lda #PERFECT_SFX_WAVE
ora #$01
sta SID_V3_CTRL
rts
; ----------------------------------------------------------------------------
; Play Good Sound
; ----------------------------------------------------------------------------
play_good_sound:
lda #0
sta SID_V3_FREQ_LO
lda #GOOD_SFX_FREQ
sta SID_V3_FREQ_HI
lda #GOOD_SFX_AD
sta SID_V3_AD
lda #GOOD_SFX_SR
sta SID_V3_SR
lda #GOOD_SFX_WAVE
ora #$01
sta SID_V3_CTRL
rts
; ----------------------------------------------------------------------------
; Increase Health
; ----------------------------------------------------------------------------
increase_health:
clc
adc health
cmp #HEALTH_MAX
bcc health_ok
lda #HEALTH_MAX
health_ok:
sta health
jsr display_health
rts
; ----------------------------------------------------------------------------
; Decrease Health
; ----------------------------------------------------------------------------
decrease_health:
sta temp_track
lda health
sec
sbc temp_track
bcs health_not_zero
lda #0
health_not_zero:
sta health
jsr display_health
; Check for game over
lda health
bne no_game_over
jsr show_gameover
lda #STATE_GAMEOVER
sta game_state
no_game_over:
rts
; ----------------------------------------------------------------------------
; Display Health Bar
; ----------------------------------------------------------------------------
display_health:
; Calculate filled blocks (health / 4 = blocks, max 16)
lda health
lsr
lsr
sta temp_track
ldx #0
draw_health_bar:
cpx temp_track
bcs draw_empty_health
lda #CHAR_BAR_FULL
jmp store_health_char
draw_empty_health:
lda #CHAR_BAR_EMPTY
store_health_char:
sta SCREEN + (HEALTH_ROW * 40) + 8,x
lda #HEALTH_COL
sta COLRAM + (HEALTH_ROW * 40) + 8,x
inx
cpx #16
bne draw_health_bar
rts
; ----------------------------------------------------------------------------
; Display Progress Bar
; ----------------------------------------------------------------------------
display_progress:
; Calculate progress (song_beat / 4)
lda song_beat
lsr
lsr
sta temp_track
ldx #0
draw_progress_bar:
cpx temp_track
bcs draw_empty_progress
lda #CHAR_BAR_FULL
jmp store_progress_char
draw_empty_progress:
lda #CHAR_BAR_EMPTY
store_progress_char:
sta SCREEN + (PROGRESS_ROW * 40) + 8,x
lda #PROGRESS_COL
sta COLRAM + (PROGRESS_ROW * 40) + 8,x
inx
cpx #PROGRESS_WIDTH
bne draw_progress_bar
rts
; ----------------------------------------------------------------------------
; Combo System
; ----------------------------------------------------------------------------
increment_combo:
inc combo
lda combo
cmp max_combo
bcc combo_no_max
sta max_combo
combo_no_max:
jsr display_combo
rts
break_combo:
lda #0
sta combo
jsr display_combo
rts
display_combo:
; Display combo count
lda combo
ldx #0
combo_div_100:
cmp #100
bcc combo_done_100
sec
sbc #100
inx
jmp combo_div_100
combo_done_100:
pha
txa
ora #$30
sta SCREEN + (COMBO_ROW * 40) + 34
pla
ldx #0
combo_div_10:
cmp #10
bcc combo_done_10
sec
sbc #10
inx
jmp combo_div_10
combo_done_10:
pha
txa
ora #$30
sta SCREEN + (COMBO_ROW * 40) + 35
pla
ora #$30
sta SCREEN + (COMBO_ROW * 40) + 36
; Colour based on multiplier
jsr get_multiplier
cmp #1
beq combo_col_1x
cmp #2
beq combo_col_2x
cmp #3
beq combo_col_3x
jmp combo_col_4x
combo_col_1x:
lda #11 ; Grey
ldx #COMBO_BORDER_1 ; Dark grey border
jmp set_combo_col
combo_col_2x:
lda #7 ; Yellow
ldx #COMBO_BORDER_2 ; Green border
jmp set_combo_col
combo_col_3x:
lda #5 ; Green
ldx #COMBO_BORDER_3 ; Yellow border
jmp set_combo_col
combo_col_4x:
lda #1 ; White
ldx #COMBO_BORDER_4 ; Red border (fire!)
set_combo_col:
sta COLRAM + (COMBO_ROW * 40) + 34
sta COLRAM + (COMBO_ROW * 40) + 35
sta COLRAM + (COMBO_ROW * 40) + 36
; Update border colour for visual feedback
lda combo
beq reset_border ; No combo = black border
stx BORDER ; Set border to tier colour
rts
reset_border:
lda #COMBO_BORDER_0
sta BORDER
rts
get_multiplier:
lda combo
cmp #COMBO_TIER_4
bcs mult_4x
cmp #COMBO_TIER_3
bcs mult_3x
cmp #COMBO_TIER_2
bcs mult_2x
lda #1
rts
mult_2x:
lda #2
rts
mult_3x:
lda #3
rts
mult_4x:
lda #4
rts
; ----------------------------------------------------------------------------
; Reset Track Colours
; ----------------------------------------------------------------------------
reset_track_colours:
ldx #1 ; Start at column 1 (skip label)
reset_col_loop:
lda #TRACK_LINE_COL
sta COLRAM + (TRACK1_ROW * 40),x
sta COLRAM + (TRACK2_ROW * 40),x
sta COLRAM + (TRACK3_ROW * 40),x
inx
cpx #38
bne reset_col_loop
; Restore hit zone colours
lda #HIT_ZONE_COL
sta COLRAM + (TRACK1_ROW * 40) + HIT_ZONE_COLUMN
sta COLRAM + (TRACK2_ROW * 40) + HIT_ZONE_COLUMN
sta COLRAM + (TRACK3_ROW * 40) + HIT_ZONE_COLUMN
; Redraw notes with correct colours
ldx #0
redraw_loop:
lda note_track,x
beq redraw_next
jsr draw_note
redraw_next:
inx
cpx #MAX_NOTES
bne redraw_loop
rts
; ----------------------------------------------------------------------------
; Update Border Flash
; ----------------------------------------------------------------------------
update_border_flash:
lda border_flash
beq border_flash_done
dec border_flash
bne border_flash_done
lda #BORDER_COL
sta BORDER
border_flash_done:
; Update background flash (perfect hit effect)
lda bg_flash
beq bg_flash_done
dec bg_flash
bne bg_flash_done
; Reset background to default
lda #6 ; Blue background
sta BGCOL
bg_flash_done:
; Update beat pulse marker
jsr update_beat_marker
rts
; ----------------------------------------------------------------------------
; Update Beat Marker
; ----------------------------------------------------------------------------
; Shows a pulsing indicator that helps players feel the rhythm.
; Pulses bright on downbeat, fades through the beat.
; Also pulses the hit zone colours for visual timing cues.
update_beat_marker:
lda beat_pulse
beq beat_marker_dim
; Pulse is active - show bright marker
dec beat_pulse
lda beat_pulse
lsr ; Divide by 2 for colour selection
and #$03 ; Keep in range 0-3
tax
lda beat_colours,x
sta COLRAM + (HIT_ROW * 40) + 19 ; Centre of hit zone
lda #$51 ; Filled circle character
sta SCREEN + (HIT_ROW * 40) + 19
; ----------------------------------------
; Pulse hit zone colours (new in Unit 36)
; ----------------------------------------
lda beat_pulse
lsr
and #$03
tax
lda hitzone_pulse_cols,x
sta COLRAM + (TRACK1_ROW * 40) + HIT_ZONE_COLUMN
sta COLRAM + (TRACK2_ROW * 40) + HIT_ZONE_COLUMN
sta COLRAM + (TRACK3_ROW * 40) + HIT_ZONE_COLUMN
rts
beat_marker_dim:
; Show dim marker when not pulsing
lda #11 ; Dark grey
sta COLRAM + (HIT_ROW * 40) + 19
lda #$57 ; Empty circle character
sta SCREEN + (HIT_ROW * 40) + 19
; Reset hit zone to normal colour
lda #HIT_ZONE_COL ; Yellow (7)
sta COLRAM + (TRACK1_ROW * 40) + HIT_ZONE_COLUMN
sta COLRAM + (TRACK2_ROW * 40) + HIT_ZONE_COLUMN
sta COLRAM + (TRACK3_ROW * 40) + HIT_ZONE_COLUMN
rts
beat_colours:
!byte 1 ; White (brightest)
!byte 7 ; Yellow
!byte 5 ; Green
!byte 11 ; Dark grey (dimmest)
; Hit zone pulse colours - bright to normal
hitzone_pulse_cols:
!byte 1 ; White (brightest on beat)
!byte 13 ; Light green
!byte 7 ; Yellow
!byte 7 ; Yellow (normal)
; ----------------------------------------------------------------------------
; Check Keys
; ----------------------------------------------------------------------------
check_keys:
lda #$FD
sta CIA1_PRA
lda CIA1_PRB
and #$10
bne check_x_key
lda #1
sta key_pressed
jsr check_hit
bcc check_x_key
jsr play_voice1_note
jsr flash_track1_hit
jsr award_points
check_x_key:
lda #$FB
sta CIA1_PRA
lda CIA1_PRB
and #$80
bne check_c_key
lda #2
sta key_pressed
jsr check_hit
bcc check_c_key
jsr play_voice2_note
jsr flash_track2_hit
jsr award_points
check_c_key:
lda #$FB
sta CIA1_PRA
lda CIA1_PRB
and #$10
bne check_keys_done
lda #3
sta key_pressed
jsr check_hit
bcc check_keys_done
jsr play_voice3_note
jsr flash_track3_hit
jsr award_points
check_keys_done:
lda #$FF
sta CIA1_PRA
rts
; ----------------------------------------------------------------------------
; Check Hit (with difficulty-adjusted timing windows)
; ----------------------------------------------------------------------------
check_hit:
ldx #0
check_hit_loop:
lda note_track,x
beq check_hit_next
cmp key_pressed
bne check_hit_next
; Check if note is in hittable range
lda note_col,x
cmp #HIT_ZONE_START
bcc check_hit_next
cmp #HIT_ZONE_END+1
bcs check_hit_next
; Note is hittable - determine quality based on distance from perfect
lda note_freq,x
sta hit_note_freq
; Calculate distance from perfect column
lda note_col,x
sec
sbc #PERFECT_COL_POS
bcs dist_positive
; Negative distance - make it positive
eor #$FF
clc
adc #1
dist_positive:
; A now contains absolute distance from perfect
; Check if within perfect window
cmp perfect_window
bcc hit_is_perfect
beq hit_is_perfect
; Check if within good window
cmp good_window
bcc hit_is_good
beq hit_is_good
; Outside good window but in hit zone - still counts as good
jmp hit_is_good
hit_is_perfect:
lda #2
sta hit_quality
jmp hit_found
hit_is_good:
lda #1
sta hit_quality
hit_found:
jsr erase_note
lda #0
sta note_track,x
sec
rts
check_hit_next:
inx
cpx #MAX_NOTES
bne check_hit_loop
lda #0
sta hit_quality
clc
rts
; ----------------------------------------------------------------------------
; Check Song End
; ----------------------------------------------------------------------------
check_song_end:
lda song_ended
beq not_ended
; Check if all notes cleared
ldx #0
check_notes_clear:
lda note_track,x
bne not_ended
inx
cpx #MAX_NOTES
bne check_notes_clear
; Add delay before results
inc end_delay
lda end_delay
cmp #END_DELAY_FRAMES
bcc not_ended
; Check for endless mode
lda endless_mode
beq end_song_normal
; Endless mode - loop the song
inc loop_count
jsr display_loop_count
jsr init_song ; Reset song position
lda #0
sta end_delay
sta song_ended
rts
end_song_normal:
; Show results
jsr show_results
lda #STATE_RESULTS
sta game_state
not_ended:
rts
; ----------------------------------------------------------------------------
; Display Loop Count (for Endless Mode)
; ----------------------------------------------------------------------------
display_loop_count:
; Display "LOOP X" in top right during endless mode
; Position: row 1, column 32
lda #'l'
sta SCREEN + (1 * 40) + 32
lda #'o'
sta SCREEN + (1 * 40) + 33
sta SCREEN + (1 * 40) + 34
lda #'p'
sta SCREEN + (1 * 40) + 35
lda #CHAR_SPACE
sta SCREEN + (1 * 40) + 36
; Display loop number (max 9 displayed)
lda loop_count
cmp #10
bcc display_loop_digit
lda #9 ; Cap display at 9
display_loop_digit:
clc
adc #$30 ; Convert to ASCII digit
sta SCREEN + (1 * 40) + 37
; Colour the loop display cyan
lda #3 ; Cyan
sta COLRAM + (1 * 40) + 32
sta COLRAM + (1 * 40) + 33
sta COLRAM + (1 * 40) + 34
sta COLRAM + (1 * 40) + 35
sta COLRAM + (1 * 40) + 37
rts
; ----------------------------------------------------------------------------
; Award Points
; ----------------------------------------------------------------------------
award_points:
jsr increment_combo
inc notes_hit ; Track total hits for accuracy
lda hit_quality
cmp #2
beq award_perfect
; Good hit - resets perfect streak
lda #0
sta perfect_streak
lda #GOOD_SCORE
jsr apply_multiplier
jsr add_score
inc good_count
; Play good sound effect
jsr play_good_sound
lda #GOOD_COL
sta BORDER
lda #4
sta border_flash
lda #HEALTH_GOOD
jsr increase_health
jmp award_done
award_perfect:
; Perfect hit - increment streak
inc perfect_streak
; Check for streak bonus (every STREAK_THRESHOLD perfects)
lda perfect_streak
cmp #STREAK_THRESHOLD
bne no_streak_bonus
; Award streak bonus
lda #STREAK_BONUS
jsr add_score
lda #0
sta perfect_streak ; Reset for next milestone
; Flash border cyan for streak bonus
lda #3 ; Cyan
sta BORDER
no_streak_bonus:
; Update best streak
lda perfect_streak
cmp best_streak
bcc skip_best_update
sta best_streak
skip_best_update:
lda #PERFECT_SCORE
jsr apply_multiplier
jsr add_score
inc perfect_count
; Play perfect sound effect
jsr play_perfect_sound
lda #PERFECT_COL
sta BORDER
lda #6
sta border_flash
; Screen flash effect for perfect hits
lda #0 ; Black background flash
sta BGCOL
lda #3 ; Flash duration
sta bg_flash
lda #HEALTH_PERFECT
jsr increase_health
award_done:
jsr display_score
rts
; ----------------------------------------------------------------------------
; Check Section Bonus
; ----------------------------------------------------------------------------
; Awards bonus at 25%, 50%, 75% of song completion
check_section_bonus:
; Calculate section thresholds based on song_length
; 25% = song_length / 4
; 50% = song_length / 2
; 75% = song_length * 3 / 4
; Check 25% (song_length / 4)
lda song_length
lsr
lsr ; A = song_length / 4
cmp song_beat
bne check_50
; Award 25% section bonus
lda section_bonus
and #$01 ; Check if already awarded
bne section_done
lda section_bonus
ora #$01 ; Mark 25% as awarded
sta section_bonus
jsr award_section_bonus
rts
check_50:
; Check 50% (song_length / 2)
lda song_length
lsr ; A = song_length / 2
cmp song_beat
bne check_75
; Award 50% section bonus
lda section_bonus
and #$02
bne section_done
lda section_bonus
ora #$02
sta section_bonus
jsr award_section_bonus
rts
check_75:
; Check 75% (song_length - song_length/4)
lda song_length
lsr
lsr
sta ZP_TEMP ; song_length / 4
lda song_length
sec
sbc ZP_TEMP ; song_length - song_length/4
cmp song_beat
bne section_done
; Award 75% section bonus
lda section_bonus
and #$04
bne section_done
lda section_bonus
ora #$04
sta section_bonus
jsr award_section_bonus
section_done:
rts
award_section_bonus:
; Add section bonus to score
lda #SECTION_BONUS
jsr add_score
jsr display_score
; Flash border purple for section bonus
lda #4 ; Purple
sta BORDER
lda #8
sta border_flash
rts
; ----------------------------------------------------------------------------
; Apply Multiplier
; ----------------------------------------------------------------------------
apply_multiplier:
sta base_score
jsr get_multiplier
sta current_mult
lda base_score
sta score_add_lo
lda #0
sta score_add_hi
lda current_mult
cmp #1
beq mult_done_apply
dec current_mult
mult_add_loop:
lda score_add_lo
clc
adc base_score
sta score_add_lo
lda score_add_hi
adc #0
sta score_add_hi
dec current_mult
bne mult_add_loop
mult_done_apply:
rts
base_score: !byte 0
current_mult: !byte 0
score_add_lo: !byte 0
score_add_hi: !byte 0
; ----------------------------------------------------------------------------
; Add Score
; ----------------------------------------------------------------------------
add_score:
lda score_lo
clc
adc score_add_lo
sta score_lo
lda score_hi
adc score_add_hi
sta score_hi
rts
; ----------------------------------------------------------------------------
; Check and Update High Score
; ----------------------------------------------------------------------------
; Compares current score against high score for current song/difficulty.
; Sets new_high_score flag if current score is higher and updates table.
check_high_score:
; Clear new high score flag
lda #0
sta new_high_score
; Calculate table index: (selected_song * 3 + difficulty) * 2
lda selected_song
asl ; × 2
clc
adc selected_song ; × 3
clc
adc difficulty ; + difficulty
asl ; × 2 (for 2-byte entries)
tax ; X = table index
; Compare current score with high score
; First compare high bytes
lda score_hi
cmp high_scores+1,x ; Compare high byte
bcc hs_not_higher ; Current < high, not new record
bne hs_is_higher ; Current > high, new record
; High bytes equal, compare low bytes
lda score_lo
cmp high_scores,x ; Compare low byte
bcc hs_not_higher ; Current < high
beq hs_not_higher ; Current = high (not strictly greater)
hs_is_higher:
; New high score! Update table
lda score_lo
sta high_scores,x
lda score_hi
sta high_scores+1,x
; Set flag
lda #1
sta new_high_score
hs_not_higher:
rts
; Get high score for current song/difficulty into work_lo/work_hi
get_high_score:
; Calculate table index: (selected_song * 3 + difficulty) * 2
lda selected_song
asl
clc
adc selected_song
clc
adc difficulty
asl
tax
lda high_scores,x
sta work_lo
lda high_scores+1,x
sta work_hi
rts
; ----------------------------------------------------------------------------
; Display Score
; ----------------------------------------------------------------------------
display_score:
lda score_lo
sta work_lo
lda score_hi
sta work_hi
ldx #0
div_10000:
lda work_lo
sec
sbc #<10000
tay
lda work_hi
sbc #>10000
bcc done_10000
sta work_hi
sty work_lo
inx
jmp div_10000
done_10000:
txa
ora #$30
sta SCREEN + 8
ldx #0
div_1000:
lda work_lo
sec
sbc #<1000
tay
lda work_hi
sbc #>1000
bcc done_1000
sta work_hi
sty work_lo
inx
jmp div_1000
done_1000:
txa
ora #$30
sta SCREEN + 9
ldx #0
div_100:
lda work_lo
sec
sbc #100
bcc done_100
sta work_lo
inx
jmp div_100
done_100:
txa
ora #$30
sta SCREEN + 10
ldx #0
div_10:
lda work_lo
sec
sbc #10
bcc done_10
sta work_lo
inx
jmp div_10
done_10:
txa
ora #$30
sta SCREEN + 11
lda work_lo
ora #$30
sta SCREEN + 12
lda #7
sta COLRAM + 8
sta COLRAM + 9
sta COLRAM + 10
sta COLRAM + 11
sta COLRAM + 12
rts
; ----------------------------------------------------------------------------
; Display Misses
; ----------------------------------------------------------------------------
display_misses:
lda miss_count
ldx #0
miss_div_10:
cmp #10
bcc miss_done_10
sec
sbc #10
inx
jmp miss_div_10
miss_done_10:
pha
txa
ora #$30
sta SCREEN + 21
pla
ora #$30
sta SCREEN + 22
lda #2
sta COLRAM + 21
sta COLRAM + 22
rts
work_lo: !byte 0
work_hi: !byte 0
; ----------------------------------------------------------------------------
; Play Voices (for note playback)
; ----------------------------------------------------------------------------
play_voice1_note:
lda #0
sta SID_V1_FREQ_LO
lda hit_note_freq
sta SID_V1_FREQ_HI
lda #VOICE1_WAVE
ora #$01
sta SID_V1_CTRL
rts
play_voice2_note:
lda #0
sta SID_V2_FREQ_LO
lda hit_note_freq
sta SID_V2_FREQ_HI
lda #VOICE2_WAVE
ora #$01
sta SID_V2_CTRL
rts
play_voice3_note:
lda #0
sta SID_V3_FREQ_LO
lda hit_note_freq
sta SID_V3_FREQ_HI
lda #VOICE3_WAVE
ora #$01
sta SID_V3_CTRL
rts
; ----------------------------------------------------------------------------
; Flash Tracks
; ----------------------------------------------------------------------------
flash_track1_hit:
ldx #0
lda #HIT_COL
flash_t1h_loop:
sta COLRAM + (TRACK1_ROW * 40),x
inx
cpx #38
bne flash_t1h_loop
lda #1
sta COLRAM + (TRACK1_ROW * 40)
rts
flash_track2_hit:
ldx #0
lda #HIT_COL
flash_t2h_loop:
sta COLRAM + (TRACK2_ROW * 40),x
inx
cpx #38
bne flash_t2h_loop
lda #1
sta COLRAM + (TRACK2_ROW * 40)
rts
flash_track3_hit:
ldx #0
lda #HIT_COL
flash_t3h_loop:
sta COLRAM + (TRACK3_ROW * 40),x
inx
cpx #38
bne flash_t3h_loop
lda #1
sta COLRAM + (TRACK3_ROW * 40)
rts
; ----------------------------------------------------------------------------
; Calculate Performance Grade
; ----------------------------------------------------------------------------
; Calculates grade based on perfect hit percentage
; Sets current_grade (screen code) and current_grade_col (colour)
calculate_grade:
; Calculate perfect percentage: (perfect_count * 100) / total_notes
; For simplicity, use perfect_count vs notes_hit ratio
; notes_hit = perfect_count + good_count
; We want: perfect_count / notes_hit * 100
; If no notes hit, give D grade
lda notes_hit
bne calc_grade_continue
lda #'d' ; Screen code for D
sta current_grade
lda #2 ; Red
sta current_grade_col
rts
calc_grade_continue:
; Calculate percentage: perfect_count * 100 / notes_hit
; Use 8-bit approximation for simplicity
; First multiply perfect_count by 100
lda perfect_count
sta work_lo
lda #0
sta work_hi
; Multiply by 100 (64 + 32 + 4 = 100)
; work = perfect * 64
asl work_lo
rol work_hi ; *2
asl work_lo
rol work_hi ; *4
asl work_lo
rol work_hi ; *8
asl work_lo
rol work_hi ; *16
asl work_lo
rol work_hi ; *32
asl work_lo
rol work_hi ; *64
; Save *64 result
lda work_lo
sta ZP_TEMP
lda work_hi
pha ; Save high byte of *64
; Get *32 (shift right from *64)
lsr work_hi
ror work_lo ; *32 in work
; Add *64 + *32 = *96
lda ZP_TEMP
clc
adc work_lo
sta work_lo
pla
adc work_hi
sta work_hi ; work = perfect * 96
; Add *4 to get *100
lda perfect_count
asl
asl ; A = perfect * 4
clc
adc work_lo
sta work_lo
lda #0
adc work_hi
sta work_hi ; work = perfect * 100
; Now divide by notes_hit
; Simple repeated subtraction for small values
lda #0
sta ZP_TEMP ; Quotient (percentage)
grade_div_loop:
; Check if work >= notes_hit
lda work_hi
bne grade_can_sub ; High byte nonzero, can subtract
lda work_lo
cmp notes_hit
bcc grade_div_done ; work < notes_hit, done
grade_can_sub:
; Subtract notes_hit from work
lda work_lo
sec
sbc notes_hit
sta work_lo
lda work_hi
sbc #0
sta work_hi
inc ZP_TEMP ; Increment percentage
lda ZP_TEMP
cmp #101 ; Cap at 100%
bcc grade_div_loop
grade_div_done:
; ZP_TEMP now contains percentage (0-100)
; Determine grade based on thresholds
lda ZP_TEMP
cmp #GRADE_S_THRESHOLD
bcs grade_is_s
cmp #GRADE_A_THRESHOLD
bcs grade_is_a
cmp #GRADE_B_THRESHOLD
bcs grade_is_b
cmp #GRADE_C_THRESHOLD
bcs grade_is_c
; Below C threshold = D
lda #'d'
sta current_grade
lda #2 ; Red
sta current_grade_col
rts
grade_is_s:
lda #'s'
sta current_grade
lda #7 ; Yellow
sta current_grade_col
rts
grade_is_a:
lda #'a'
sta current_grade
lda #5 ; Green
sta current_grade_col
rts
grade_is_b:
lda #'b'
sta current_grade
lda #3 ; Cyan
sta current_grade_col
rts
grade_is_c:
lda #'c'
sta current_grade
lda #15 ; Light grey
sta current_grade_col
rts
; ----------------------------------------------------------------------------
; Show Results Screen
; ----------------------------------------------------------------------------
show_results:
; Check for full combo bonus (no misses)
lda miss_count
bne skip_full_combo
; Award full combo bonus!
lda #FULL_COMBO_BONUS
jsr add_score
skip_full_combo:
; Check if we beat the high score
jsr check_high_score
; Clear screen
ldx #0
lda #CHAR_SPACE
clear_results:
sta SCREEN,x
sta SCREEN+$100,x
sta SCREEN+$200,x
sta SCREEN+$2E8,x
inx
bne clear_results
; Draw "SONG COMPLETE!"
ldx #0
draw_complete:
lda complete_text,x
beq draw_grade
sta SCREEN + (5 * 40) + 13,x
lda #5
sta COLRAM + (5 * 40) + 13,x
inx
jmp draw_complete
draw_grade:
; Calculate and display performance grade
jsr calculate_grade
; Display grade label
ldx #0
draw_grade_label:
lda grade_label,x
beq draw_grade_letter
sta SCREEN + (7 * 40) + 14,x
lda #7
sta COLRAM + (7 * 40) + 14,x
inx
jmp draw_grade_label
draw_grade_letter:
; Grade letter is in A register from calculate_grade
lda current_grade
sta SCREEN + (7 * 40) + 22
; Colour based on grade
ldx current_grade_col
stx COLRAM + (7 * 40) + 22
draw_results_score:
; Draw score label
ldx #0
draw_rs_label:
lda results_score_label,x
beq draw_rs_value
sta SCREEN + (9 * 40) + 12,x
lda #7
sta COLRAM + (9 * 40) + 12,x
inx
jmp draw_rs_label
draw_rs_value:
; Draw score value
lda score_lo
sta work_lo
lda score_hi
sta work_hi
ldx #0
rs_div_10000:
lda work_lo
sec
sbc #<10000
tay
lda work_hi
sbc #>10000
bcc rs_done_10000
sta work_hi
sty work_lo
inx
jmp rs_div_10000
rs_done_10000:
txa
ora #$30
sta SCREEN + (9 * 40) + 23
ldx #0
rs_div_1000:
lda work_lo
sec
sbc #<1000
tay
lda work_hi
sbc #>1000
bcc rs_done_1000
sta work_hi
sty work_lo
inx
jmp rs_div_1000
rs_done_1000:
txa
ora #$30
sta SCREEN + (9 * 40) + 24
ldx #0
rs_div_100:
lda work_lo
sec
sbc #100
bcc rs_done_100
sta work_lo
inx
jmp rs_div_100
rs_done_100:
txa
ora #$30
sta SCREEN + (9 * 40) + 25
ldx #0
rs_div_10:
lda work_lo
sec
sbc #10
bcc rs_done_10
sta work_lo
inx
jmp rs_div_10
rs_done_10:
txa
ora #$30
sta SCREEN + (9 * 40) + 26
lda work_lo
ora #$30
sta SCREEN + (9 * 40) + 27
lda #7
sta COLRAM + (9 * 40) + 23
sta COLRAM + (9 * 40) + 24
sta COLRAM + (9 * 40) + 25
sta COLRAM + (9 * 40) + 26
sta COLRAM + (9 * 40) + 27
; Draw perfect count
ldx #0
draw_perfect_label:
lda perfect_label,x
beq draw_perfect_value
sta SCREEN + (11 * 40) + 12,x
lda #1
sta COLRAM + (11 * 40) + 12,x
inx
jmp draw_perfect_label
draw_perfect_value:
lda perfect_count
ldx #0
pv_div_10:
cmp #10
bcc pv_done_10
sec
sbc #10
inx
jmp pv_div_10
pv_done_10:
pha
txa
ora #$30
sta SCREEN + (11 * 40) + 23
pla
ora #$30
sta SCREEN + (11 * 40) + 24
lda #1
sta COLRAM + (11 * 40) + 23
sta COLRAM + (11 * 40) + 24
; Draw good count
ldx #0
draw_good_label:
lda good_label,x
beq draw_good_value
sta SCREEN + (12 * 40) + 12,x
lda #7
sta COLRAM + (12 * 40) + 12,x
inx
jmp draw_good_label
draw_good_value:
lda good_count
ldx #0
gv_div_10:
cmp #10
bcc gv_done_10
sec
sbc #10
inx
jmp gv_div_10
gv_done_10:
pha
txa
ora #$30
sta SCREEN + (12 * 40) + 23
pla
ora #$30
sta SCREEN + (12 * 40) + 24
lda #7
sta COLRAM + (12 * 40) + 23
sta COLRAM + (12 * 40) + 24
; Draw miss count
ldx #0
draw_miss_label_r:
lda miss_label_r,x
beq draw_miss_value
sta SCREEN + (13 * 40) + 12,x
lda #2
sta COLRAM + (13 * 40) + 12,x
inx
jmp draw_miss_label_r
draw_miss_value:
lda miss_count
ldx #0
mv_div_10:
cmp #10
bcc mv_done_10
sec
sbc #10
inx
jmp mv_div_10
mv_done_10:
pha
txa
ora #$30
sta SCREEN + (13 * 40) + 23
pla
ora #$30
sta SCREEN + (13 * 40) + 24
lda #2
sta COLRAM + (13 * 40) + 23
sta COLRAM + (13 * 40) + 24
; Draw max combo
ldx #0
draw_maxc_label:
lda maxcombo_label,x
beq draw_maxc_value
sta SCREEN + (15 * 40) + 12,x
lda #COMBO_COL
sta COLRAM + (15 * 40) + 12,x
inx
jmp draw_maxc_label
draw_maxc_value:
lda max_combo
ldx #0
mc_div_100:
cmp #100
bcc mc_done_100
sec
sbc #100
inx
jmp mc_div_100
mc_done_100:
pha
txa
ora #$30
sta SCREEN + (15 * 40) + 23
pla
ldx #0
mc_div_10:
cmp #10
bcc mc_done_10
sec
sbc #10
inx
jmp mc_div_10
mc_done_10:
pha
txa
ora #$30
sta SCREEN + (15 * 40) + 24
pla
ora #$30
sta SCREEN + (15 * 40) + 25
lda #COMBO_COL
sta COLRAM + (15 * 40) + 23
sta COLRAM + (15 * 40) + 24
sta COLRAM + (15 * 40) + 25
; Check if this was a new high score
lda new_high_score
beq res_show_prev_hs
; Draw "NEW HIGH SCORE!" in bright cyan
ldx #0
res_draw_new_hs:
lda new_hs_text,x
bne + ; Branch over jump if not zero
jmp res_draw_return ; Far jump when zero
+ sta SCREEN + (17 * 40) + 12,x
lda #3 ; Cyan
sta COLRAM + (17 * 40) + 12,x
inx
jmp res_draw_new_hs
res_show_prev_hs:
; Draw "HIGH SCORE:" label
ldx #0
res_draw_hs_label:
lda high_score_text,x
beq res_draw_hs_value
sta SCREEN + (17 * 40) + 12,x
lda #11 ; Dark grey
sta COLRAM + (17 * 40) + 12,x
inx
jmp res_draw_hs_label
res_draw_hs_value:
; Get high score for current song/difficulty
jsr get_high_score
; Display 5-digit high score
ldx #0
res_hs_div_10000:
lda work_lo
sec
sbc #<10000
tay
lda work_hi
sbc #>10000
bcc res_hs_done_10000
sta work_hi
sty work_lo
inx
jmp res_hs_div_10000
res_hs_done_10000:
txa
ora #$30
sta SCREEN + (17 * 40) + 24
ldx #0
res_hs_div_1000:
lda work_lo
sec
sbc #<1000
tay
lda work_hi
sbc #>1000
bcc res_hs_done_1000
sta work_hi
sty work_lo
inx
jmp res_hs_div_1000
res_hs_done_1000:
txa
ora #$30
sta SCREEN + (17 * 40) + 25
ldx #0
res_hs_div_100:
lda work_lo
sec
sbc #100
bcc res_hs_done_100
sta work_lo
inx
jmp res_hs_div_100
res_hs_done_100:
txa
ora #$30
sta SCREEN + (17 * 40) + 26
ldx #0
res_hs_div_10:
lda work_lo
sec
sbc #10
bcc res_hs_done_10
sta work_lo
inx
jmp res_hs_div_10
res_hs_done_10:
txa
ora #$30
sta SCREEN + (17 * 40) + 27
lda work_lo
ora #$30
sta SCREEN + (17 * 40) + 28
; Colour high score digits
lda #11
sta COLRAM + (17 * 40) + 24
sta COLRAM + (17 * 40) + 25
sta COLRAM + (17 * 40) + 26
sta COLRAM + (17 * 40) + 27
sta COLRAM + (17 * 40) + 28
; Draw best streak on row 19
ldx #0
draw_streak_label:
lda streak_label,x
beq draw_streak_value
sta SCREEN + (19 * 40) + 12,x
lda #3 ; Cyan
sta COLRAM + (19 * 40) + 12,x
inx
jmp draw_streak_label
draw_streak_value:
; Display best_streak as 2-digit number
lda best_streak
ldx #0
streak_div_10:
cmp #10
bcc streak_done_10
sec
sbc #10
inx
jmp streak_div_10
streak_done_10:
pha
txa
ora #$30
sta SCREEN + (19 * 40) + 25
pla
ora #$30
sta SCREEN + (19 * 40) + 26
lda #3
sta COLRAM + (19 * 40) + 25
sta COLRAM + (19 * 40) + 26
res_draw_return:
; Draw "PRESS FIRE" on row 21
ldx #0
draw_return:
lda return_text,x
beq results_done
sta SCREEN + (21 * 40) + 10,x
lda #11
sta COLRAM + (21 * 40) + 10,x
inx
jmp draw_return
results_done:
rts
complete_text:
!scr "song complete!"
!byte 0
results_score_label:
!scr "final score:"
!byte 0
perfect_label:
!scr "perfect:"
!byte 0
good_label:
!scr "good:"
!byte 0
miss_label_r:
!scr "misses:"
!byte 0
grade_label:
!scr "grade:"
!byte 0
streak_label:
!scr "best streak:"
!byte 0
maxcombo_label:
!scr "max combo:"
!byte 0
return_text:
!scr "press fire to continue"
!byte 0
; ----------------------------------------------------------------------------
; Show Game Over Screen
; ----------------------------------------------------------------------------
show_gameover:
; Check if we beat the high score
jsr check_high_score
; Clear screen
ldx #0
lda #CHAR_SPACE
clear_gameover:
sta SCREEN,x
sta SCREEN+$100,x
sta SCREEN+$200,x
sta SCREEN+$2E8,x
inx
bne clear_gameover
; Draw "GAME OVER"
ldx #0
draw_gameover_text:
lda gameover_text,x
beq draw_gameover_score
sta SCREEN + (8 * 40) + 15,x
lda #2
sta COLRAM + (8 * 40) + 15,x
inx
jmp draw_gameover_text
draw_gameover_score:
; Draw score
ldx #0
draw_go_score_label:
lda gameover_score,x
beq draw_go_score_value
sta SCREEN + (12 * 40) + 12,x
lda #7
sta COLRAM + (12 * 40) + 12,x
inx
jmp draw_go_score_label
draw_go_score_value:
lda score_lo
sta work_lo
lda score_hi
sta work_hi
ldx #0
go_div_10000:
lda work_lo
sec
sbc #<10000
tay
lda work_hi
sbc #>10000
bcc go_done_10000
sta work_hi
sty work_lo
inx
jmp go_div_10000
go_done_10000:
txa
ora #$30
sta SCREEN + (12 * 40) + 23
ldx #0
go_div_1000:
lda work_lo
sec
sbc #<1000
tay
lda work_hi
sbc #>1000
bcc go_done_1000
sta work_hi
sty work_lo
inx
jmp go_div_1000
go_done_1000:
txa
ora #$30
sta SCREEN + (12 * 40) + 24
ldx #0
go_div_100:
lda work_lo
sec
sbc #100
bcc go_done_100
sta work_lo
inx
jmp go_div_100
go_done_100:
txa
ora #$30
sta SCREEN + (12 * 40) + 25
ldx #0
go_div_10:
lda work_lo
sec
sbc #10
bcc go_done_10
sta work_lo
inx
jmp go_div_10
go_done_10:
txa
ora #$30
sta SCREEN + (12 * 40) + 26
lda work_lo
ora #$30
sta SCREEN + (12 * 40) + 27
lda #7
sta COLRAM + (12 * 40) + 23
sta COLRAM + (12 * 40) + 24
sta COLRAM + (12 * 40) + 25
sta COLRAM + (12 * 40) + 26
sta COLRAM + (12 * 40) + 27
; Check if this was a new high score
lda new_high_score
beq draw_prev_high
; Draw "NEW HIGH SCORE!" in bright cyan
ldx #0
draw_new_hs:
lda new_hs_text,x
bne + ; Branch over jump if not zero
jmp go_draw_retry ; Far jump when zero
+ sta SCREEN + (14 * 40) + 12,x
lda #3 ; Cyan
sta COLRAM + (14 * 40) + 12,x
inx
jmp draw_new_hs
draw_prev_high:
; Draw "HIGH SCORE:" label
ldx #0
draw_hs_label:
lda high_score_text,x
beq draw_hs_value
sta SCREEN + (14 * 40) + 12,x
lda #11 ; Dark grey
sta COLRAM + (14 * 40) + 12,x
inx
jmp draw_hs_label
draw_hs_value:
; Get current high score into work_lo/work_hi
jsr get_high_score
; Draw 5-digit high score value
ldx #0
hs_div_10000:
lda work_lo
sec
sbc #<10000
tay
lda work_hi
sbc #>10000
bcc hs_done_10000
sta work_hi
sty work_lo
inx
jmp hs_div_10000
hs_done_10000:
txa
ora #$30
sta SCREEN + (14 * 40) + 24
ldx #0
hs_div_1000:
lda work_lo
sec
sbc #<1000
tay
lda work_hi
sbc #>1000
bcc hs_done_1000
sta work_hi
sty work_lo
inx
jmp hs_div_1000
hs_done_1000:
txa
ora #$30
sta SCREEN + (14 * 40) + 25
ldx #0
hs_div_100:
lda work_lo
sec
sbc #100
bcc hs_done_100
sta work_lo
inx
jmp hs_div_100
hs_done_100:
txa
ora #$30
sta SCREEN + (14 * 40) + 26
ldx #0
hs_div_10:
lda work_lo
sec
sbc #10
bcc hs_done_10
sta work_lo
inx
jmp hs_div_10
hs_done_10:
txa
ora #$30
sta SCREEN + (14 * 40) + 27
lda work_lo
ora #$30
sta SCREEN + (14 * 40) + 28
; Colour high score digits
lda #11
sta COLRAM + (14 * 40) + 24
sta COLRAM + (14 * 40) + 25
sta COLRAM + (14 * 40) + 26
sta COLRAM + (14 * 40) + 27
sta COLRAM + (14 * 40) + 28
go_draw_retry:
; Draw retry message
ldx #0
draw_retry:
lda retry_text,x
beq gameover_done
sta SCREEN + (18 * 40) + 10,x
lda #11
sta COLRAM + (18 * 40) + 10,x
inx
jmp draw_retry
gameover_done:
rts
gameover_text:
!scr "game over"
!byte 0
gameover_score:
!scr "your score:"
!byte 0
new_hs_text:
!scr "new high score!"
!byte 0
high_score_text:
!scr "high score:"
!byte 0
retry_text:
!scr "press fire to continue"
!byte 0
; ============================================================================
; SONG 1 DATA - "First Steps" (120 BPM) - Three Difficulty Variants
; ============================================================================
; Easy: Notes only on strong beats (0, 8, 16, 24...) - 8 notes
; Normal: Base pattern - 29 notes
; Hard: Dense pattern with off-beat additions - 45 notes
; --- EASY: Sparse pattern (strong beats only) ---
song1_easy:
!byte 0, 1, $47 ; Beat 0
!byte 8, 2, $27 ; Beat 8
!byte 16, 1, $35 ; Beat 16
!byte 24, 3, $11 ; Beat 24
!byte 32, 2, $2F ; Beat 32
!byte 40, 1, $58 ; Beat 40
!byte 48, 3, $1A ; Beat 48
!byte 56, 1, $47 ; Beat 56
!byte $FF
; --- NORMAL: Base pattern ---
song1_normal:
!byte 0, 1, $47
!byte 2, 2, $2C
!byte 4, 3, $11
!byte 8, 1, $3B
!byte 10, 2, $27
!byte 12, 3, $13
!byte 16, 1, $35
!byte 17, 2, $2C
!byte 18, 1, $3B
!byte 20, 3, $16
!byte 24, 1, $47
!byte 26, 2, $35
!byte 28, 3, $11
!byte 32, 2, $2F
!byte 34, 1, $4F
!byte 36, 3, $17
!byte 40, 1, $58
!byte 42, 2, $2C
!byte 44, 3, $11
!byte 46, 2, $27
!byte 48, 1, $6A
!byte 49, 2, $35
!byte 50, 1, $58
!byte 52, 3, $1A
!byte 54, 2, $2F
!byte 56, 1, $47
!byte 58, 2, $2C
!byte 60, 3, $11
!byte 62, 1, $35
!byte $FF
; --- HARD: Dense pattern (added off-beats) ---
song1_hard:
!byte 0, 1, $47
!byte 1, 3, $16 ; Added
!byte 2, 2, $2C
!byte 3, 1, $35 ; Added
!byte 4, 3, $11
!byte 5, 2, $27 ; Added
!byte 6, 1, $3B ; Added
!byte 8, 1, $3B
!byte 9, 3, $13 ; Added
!byte 10, 2, $27
!byte 11, 1, $35 ; Added
!byte 12, 3, $13
!byte 14, 2, $2C ; Added
!byte 16, 1, $35
!byte 17, 2, $2C
!byte 18, 1, $3B
!byte 19, 3, $11 ; Added
!byte 20, 3, $16
!byte 21, 1, $47 ; Added
!byte 22, 2, $35 ; Added
!byte 24, 1, $47
!byte 25, 3, $16 ; Added
!byte 26, 2, $35
!byte 27, 1, $4F ; Added
!byte 28, 3, $11
!byte 30, 2, $27 ; Added
!byte 32, 2, $2F
!byte 33, 1, $47 ; Added
!byte 34, 1, $4F
!byte 35, 3, $11 ; Added
!byte 36, 3, $17
!byte 38, 2, $2C ; Added
!byte 40, 1, $58
!byte 41, 3, $1A ; Added
!byte 42, 2, $2C
!byte 43, 1, $47 ; Added
!byte 44, 3, $11
!byte 45, 2, $35 ; Added
!byte 46, 2, $27
!byte 47, 1, $4F ; Added
!byte 48, 1, $6A
!byte 49, 2, $35
!byte 50, 1, $58
!byte 51, 3, $16 ; Added
!byte 52, 3, $1A
!byte 53, 1, $47 ; Added
!byte 54, 2, $2F
!byte 55, 3, $11 ; Added
!byte 56, 1, $47
!byte 57, 2, $27 ; Added
!byte 58, 2, $2C
!byte 59, 1, $3B ; Added
!byte 60, 3, $11
!byte 61, 2, $35 ; Added
!byte 62, 1, $35
!byte 63, 3, $16 ; Added
!byte $FF
; ============================================================================
; SONG 2 DATA - "Upbeat Groove" (130 BPM) - Three Difficulty Variants
; ============================================================================
; Easy: Notes only on strong beats - 8 notes
; Normal: Base syncopated pattern - 52 notes
; Hard: Extremely dense pattern - 72 notes
; --- EASY: Sparse pattern (strong beats only) ---
song2_easy:
!byte 0, 1, $47 ; Beat 0
!byte 8, 3, $11 ; Beat 8
!byte 16, 1, $4F ; Beat 16
!byte 24, 2, $47 ; Beat 24
!byte 32, 1, $4F ; Beat 32
!byte 40, 3, $1A ; Beat 40
!byte 48, 3, $11 ; Beat 48
!byte 56, 1, $47 ; Beat 56
!byte $FF
; --- NORMAL: Base syncopated pattern ---
song2_normal:
!byte 0, 1, $47
!byte 1, 2, $35
!byte 3, 3, $16
!byte 4, 1, $4F
!byte 5, 2, $2C
!byte 7, 1, $47
!byte 8, 3, $11
!byte 10, 2, $35
!byte 11, 1, $58
!byte 13, 2, $2C
!byte 14, 3, $1A
!byte 15, 1, $47
!byte 16, 1, $4F
!byte 17, 2, $35
!byte 18, 3, $16
!byte 19, 1, $58
!byte 20, 2, $2C
!byte 22, 1, $6A
!byte 23, 2, $35
!byte 24, 3, $11
!byte 25, 1, $58
!byte 26, 2, $47
!byte 28, 3, $1A
!byte 30, 1, $47
!byte 31, 2, $2C
!byte 32, 1, $4F
!byte 33, 3, $16
!byte 34, 2, $35
!byte 35, 1, $58
!byte 36, 3, $11
!byte 37, 1, $6A
!byte 38, 2, $47
!byte 39, 1, $58
!byte 40, 3, $1A
!byte 41, 2, $35
!byte 42, 1, $4F
!byte 43, 2, $2C
!byte 44, 1, $47
!byte 45, 3, $16
!byte 46, 2, $35
!byte 47, 1, $58
!byte 48, 3, $11
!byte 49, 2, $47
!byte 51, 1, $4F
!byte 52, 3, $1A
!byte 54, 2, $35
!byte 55, 1, $47
!byte 56, 3, $11
!byte 58, 2, $2C
!byte 59, 1, $58
!byte 60, 3, $16
!byte 61, 2, $35
!byte 62, 1, $47
!byte $FF
; --- HARD: Extremely dense pattern ---
song2_hard:
!byte 0, 1, $47
!byte 0, 3, $11 ; Chord
!byte 1, 2, $35
!byte 2, 1, $4F ; Added
!byte 3, 3, $16
!byte 4, 1, $4F
!byte 4, 2, $2C ; Chord
!byte 5, 2, $2C
!byte 6, 3, $1A ; Added
!byte 7, 1, $47
!byte 8, 3, $11
!byte 8, 1, $58 ; Chord
!byte 9, 2, $35 ; Added
!byte 10, 2, $35
!byte 11, 1, $58
!byte 12, 3, $16 ; Added
!byte 13, 2, $2C
!byte 14, 3, $1A
!byte 15, 1, $47
!byte 16, 1, $4F
!byte 16, 3, $11 ; Chord
!byte 17, 2, $35
!byte 18, 3, $16
!byte 19, 1, $58
!byte 20, 2, $2C
!byte 20, 1, $47 ; Chord
!byte 21, 3, $1A ; Added
!byte 22, 1, $6A
!byte 23, 2, $35
!byte 24, 3, $11
!byte 24, 1, $4F ; Chord
!byte 25, 1, $58
!byte 26, 2, $47
!byte 27, 3, $16 ; Added
!byte 28, 3, $1A
!byte 28, 1, $58 ; Chord
!byte 29, 2, $35 ; Added
!byte 30, 1, $47
!byte 31, 2, $2C
!byte 32, 1, $4F
!byte 32, 3, $11 ; Chord
!byte 33, 3, $16
!byte 34, 2, $35
!byte 35, 1, $58
!byte 36, 3, $11
!byte 36, 2, $47 ; Chord
!byte 37, 1, $6A
!byte 38, 2, $47
!byte 39, 1, $58
!byte 40, 3, $1A
!byte 40, 1, $4F ; Chord
!byte 41, 2, $35
!byte 42, 1, $4F
!byte 43, 2, $2C
!byte 44, 1, $47
!byte 44, 3, $11 ; Chord
!byte 45, 3, $16
!byte 46, 2, $35
!byte 47, 1, $58
!byte 48, 3, $11
!byte 48, 1, $6A ; Chord
!byte 49, 2, $47
!byte 50, 1, $58 ; Added
!byte 51, 1, $4F
!byte 52, 3, $1A
!byte 52, 2, $35 ; Chord
!byte 53, 1, $47 ; Added
!byte 54, 2, $35
!byte 55, 1, $47
!byte 56, 3, $11
!byte 56, 1, $4F ; Chord
!byte 57, 2, $47 ; Added
!byte 58, 2, $2C
!byte 59, 1, $58
!byte 60, 3, $16
!byte 60, 1, $47 ; Chord
!byte 61, 2, $35
!byte 62, 1, $47
!byte 63, 3, $11 ; Added
!byte $FF
; ============================================================================
; SONG 3 DATA: "Speed Rush" (150 BPM)
; ============================================================================
; An energetic, fast-paced track designed to test reaction time.
; Higher frequencies and rapid note sequences.
; --- EASY: Strong beats only (8 notes) ---
song3_easy:
!byte 0, 1, $58 ; Beat 0
!byte 8, 2, $35 ; Beat 8
!byte 16, 3, $1A ; Beat 16
!byte 24, 1, $6A ; Beat 24
!byte 32, 2, $47 ; Beat 32
!byte 40, 3, $16 ; Beat 40
!byte 48, 1, $58 ; Beat 48
!byte 56, 2, $35 ; Beat 56
!byte $FF
; --- NORMAL: Base pattern (32 notes) ---
song3_normal:
!byte 0, 1, $58
!byte 2, 2, $35
!byte 4, 3, $1A
!byte 6, 1, $6A
!byte 8, 2, $35
!byte 10, 1, $58
!byte 12, 3, $16
!byte 14, 2, $47
!byte 16, 3, $1A
!byte 18, 1, $6A
!byte 20, 2, $35
!byte 22, 3, $16
!byte 24, 1, $6A
!byte 26, 2, $47
!byte 28, 3, $1A
!byte 30, 1, $58
!byte 32, 2, $47
!byte 34, 1, $58
!byte 36, 3, $16
!byte 38, 2, $35
!byte 40, 3, $16
!byte 42, 1, $6A
!byte 44, 2, $47
!byte 46, 3, $1A
!byte 48, 1, $58
!byte 50, 2, $35
!byte 52, 3, $16
!byte 54, 1, $6A
!byte 56, 2, $35
!byte 58, 3, $1A
!byte 60, 1, $58
!byte 62, 2, $47
!byte $FF
; --- HARD: Dense pattern with rapid-fire sections (56 notes) ---
song3_hard:
!byte 0, 1, $58
!byte 1, 3, $1A ; Added
!byte 2, 2, $35
!byte 3, 1, $6A ; Added
!byte 4, 3, $1A
!byte 5, 2, $47 ; Added
!byte 6, 1, $6A
!byte 7, 3, $16 ; Added
!byte 8, 2, $35
!byte 9, 1, $58 ; Added
!byte 10, 1, $58
!byte 11, 2, $35 ; Added
!byte 12, 3, $16
!byte 13, 1, $6A ; Added
!byte 14, 2, $47
!byte 15, 3, $1A ; Added
!byte 16, 3, $1A
!byte 17, 1, $58 ; Added
!byte 18, 1, $6A
!byte 19, 2, $35 ; Added
!byte 20, 2, $35
!byte 21, 3, $16 ; Added
!byte 22, 3, $16
!byte 23, 1, $58 ; Added
!byte 24, 1, $6A
!byte 25, 2, $47 ; Added
!byte 26, 2, $47
!byte 27, 3, $1A ; Added
!byte 28, 3, $1A
!byte 29, 1, $6A ; Added
!byte 30, 1, $58
!byte 31, 2, $35 ; Added
!byte 32, 2, $47
!byte 33, 3, $16 ; Added
!byte 34, 1, $58
!byte 35, 2, $47 ; Added
!byte 36, 3, $16
!byte 37, 1, $6A ; Added
!byte 38, 2, $35
!byte 39, 3, $1A ; Added
!byte 40, 3, $16
!byte 41, 1, $58 ; Added
!byte 42, 1, $6A
!byte 43, 2, $35 ; Added
!byte 44, 2, $47
!byte 45, 3, $16 ; Added
!byte 46, 3, $1A
!byte 47, 1, $6A ; Added
!byte 48, 1, $58
!byte 49, 2, $47 ; Added
!byte 50, 2, $35
!byte 51, 3, $1A ; Added
!byte 52, 3, $16
!byte 53, 1, $58 ; Added
!byte 54, 1, $6A
!byte 55, 2, $35 ; Added
!byte 56, 2, $35
!byte 57, 3, $16 ; Added
!byte 58, 3, $1A
!byte 59, 1, $6A ; Added
!byte 60, 1, $58
!byte 61, 2, $47 ; Added
!byte 62, 2, $47
!byte 63, 3, $1A ; Added
!byte $FF
; ============================================================================
; SONG 4: "Off-Beat" (125 BPM) - Syncopated rhythms
; ============================================================================
; Syncopation emphasises off-beats. Notes land between expected beats,
; challenging players' sense of rhythm. The pattern feels "pushed" forward.
; --- EASY: Sparse syncopated notes (10 notes) ---
; Only the most prominent off-beat accents
song4_easy:
!byte 1, 1, $47 ; Off-beat accent
!byte 9, 2, $3B ; Pushed note
!byte 17, 3, $27 ; Syncopated hit
!byte 25, 1, $47 ; Off-beat
!byte 33, 2, $3B ; Pushed
!byte 41, 3, $27 ; Syncopated
!byte 49, 1, $47 ; Off-beat
!byte 55, 2, $3B ; Pushed
!byte 59, 3, $27 ; Syncopated
!byte 63, 1, $47 ; Final accent
!byte $FF
; --- NORMAL: Syncopated pattern with anchors (32 notes) ---
; Mix of on-beat anchors and off-beat accents
song4_normal:
!byte 0, 1, $47 ; Anchor
!byte 1, 2, $3B ; Off-beat
!byte 3, 3, $27 ; Syncopated
!byte 4, 1, $47 ; Anchor
!byte 5, 2, $3B ; Off-beat
!byte 7, 3, $27 ; Syncopated
!byte 8, 1, $47 ; Anchor
!byte 9, 2, $3B ; Off-beat
!byte 11, 3, $27 ; Syncopated
!byte 12, 1, $47 ; Anchor
!byte 13, 2, $3B ; Off-beat
!byte 15, 3, $27 ; Syncopated
!byte 16, 1, $47 ; Anchor
!byte 17, 2, $3B ; Off-beat
!byte 19, 3, $27 ; Syncopated
!byte 20, 1, $47 ; Anchor
!byte 21, 2, $3B ; Off-beat
!byte 23, 3, $27 ; Syncopated
!byte 24, 1, $47 ; Anchor
!byte 25, 2, $3B ; Off-beat
!byte 27, 3, $27 ; Syncopated
!byte 28, 1, $47 ; Anchor
!byte 29, 2, $3B ; Off-beat
!byte 31, 3, $27 ; Syncopated
!byte 32, 1, $47 ; Anchor
!byte 33, 2, $3B ; Off-beat
!byte 35, 3, $27 ; Syncopated
!byte 40, 1, $47 ; Anchor
!byte 41, 2, $3B ; Off-beat
!byte 48, 1, $47 ; Anchor
!byte 49, 3, $27 ; Off-beat
!byte 56, 1, $47 ; Final anchor
!byte $FF
; --- HARD: Dense syncopated chaos (56 notes) ---
; Nearly every off-beat filled, minimal anchors
song4_hard:
!byte 0, 1, $47 ; Anchor
!byte 1, 2, $3B ; Off-beat
!byte 1, 3, $27 ; Chord
!byte 3, 1, $47 ; Syncopated
!byte 3, 2, $3B ; Chord
!byte 5, 3, $27 ; Off-beat
!byte 5, 1, $47 ; Chord
!byte 7, 2, $3B ; Syncopated
!byte 7, 3, $27 ; Chord
!byte 8, 1, $47 ; Anchor
!byte 9, 2, $3B ; Off-beat
!byte 9, 3, $27 ; Chord
!byte 11, 1, $47 ; Syncopated
!byte 11, 2, $3B ; Chord
!byte 13, 3, $27 ; Off-beat
!byte 13, 1, $47 ; Chord
!byte 15, 2, $3B ; Syncopated
!byte 15, 3, $27 ; Chord
!byte 16, 1, $47 ; Anchor
!byte 17, 2, $3B ; Off-beat
!byte 17, 3, $27 ; Chord
!byte 19, 1, $47 ; Syncopated
!byte 19, 2, $3B ; Chord
!byte 21, 3, $27 ; Off-beat
!byte 21, 1, $47 ; Chord
!byte 23, 2, $3B ; Syncopated
!byte 23, 3, $27 ; Chord
!byte 24, 1, $47 ; Anchor
!byte 25, 2, $3B ; Off-beat
!byte 25, 3, $27 ; Chord
!byte 27, 1, $47 ; Syncopated
!byte 27, 2, $3B ; Chord
!byte 29, 3, $27 ; Off-beat
!byte 29, 1, $47 ; Chord
!byte 31, 2, $3B ; Syncopated
!byte 31, 3, $27 ; Chord
!byte 32, 1, $47 ; Anchor
!byte 33, 2, $3B ; Off-beat
!byte 35, 3, $27 ; Syncopated
!byte 37, 1, $47 ; Off-beat
!byte 39, 2, $3B ; Syncopated
!byte 40, 1, $47 ; Anchor
!byte 41, 3, $27 ; Off-beat
!byte 43, 2, $3B ; Syncopated
!byte 45, 1, $47 ; Off-beat
!byte 47, 3, $27 ; Syncopated
!byte 48, 1, $47 ; Anchor
!byte 49, 2, $3B ; Off-beat
!byte 51, 3, $27 ; Syncopated
!byte 53, 1, $47 ; Off-beat
!byte 55, 2, $3B ; Syncopated
!byte 56, 1, $47 ; Anchor
!byte 57, 3, $27 ; Off-beat
!byte 59, 2, $3B ; Syncopated
!byte 61, 1, $47 ; Off-beat
!byte 63, 3, $27 ; Final syncopated
!byte $FF
; ============================================================================
; SONG 5: "Chordstorm" (136 BPM) - Polyrhythms
; ============================================================================
; Polyrhythms feature multiple notes on the same beat across different tracks,
; creating chord-like moments that require simultaneous key presses.
; --- EASY: Sparse chords (12 notes) ---
; Simple two-note chords on strong beats
song5_easy:
!byte 0, 1, $47 ; Track 1
!byte 0, 2, $3B ; Track 2 (chord)
!byte 8, 2, $3B ; Single
!byte 16, 1, $47 ; Track 1
!byte 16, 3, $27 ; Track 3 (chord)
!byte 24, 3, $27 ; Single
!byte 32, 1, $47 ; Track 1
!byte 32, 2, $3B ; Track 2 (chord)
!byte 40, 2, $3B ; Single
!byte 48, 2, $3B ; Track 2
!byte 48, 3, $27 ; Track 3 (chord)
!byte 56, 1, $47 ; Single
!byte $FF
; --- NORMAL: Mixed chords and singles (36 notes) ---
; Regular chord patterns with some singles
song5_normal:
!byte 0, 1, $47 ; 3-note chord
!byte 0, 2, $3B
!byte 0, 3, $27
!byte 4, 1, $47 ; Single
!byte 8, 2, $3B ; 2-note chord
!byte 8, 3, $27
!byte 12, 2, $3B ; Single
!byte 16, 1, $47 ; 3-note chord
!byte 16, 2, $3B
!byte 16, 3, $27
!byte 20, 3, $27 ; Single
!byte 24, 1, $47 ; 2-note chord
!byte 24, 2, $3B
!byte 28, 1, $47 ; Single
!byte 32, 2, $3B ; 3-note chord
!byte 32, 1, $47
!byte 32, 3, $27
!byte 36, 2, $3B ; Single
!byte 40, 1, $47 ; 2-note chord
!byte 40, 3, $27
!byte 44, 3, $27 ; Single
!byte 48, 1, $47 ; 3-note chord
!byte 48, 2, $3B
!byte 48, 3, $27
!byte 52, 1, $47 ; Single
!byte 56, 2, $3B ; 2-note chord
!byte 56, 3, $27
!byte 60, 1, $47 ; Single
!byte $FF
; --- HARD: Dense chord patterns (64 notes) ---
; Frequent chords with minimal breaks
song5_hard:
!byte 0, 1, $47 ; 3-note chord
!byte 0, 2, $3B
!byte 0, 3, $27
!byte 2, 1, $47 ; 2-note chord
!byte 2, 2, $3B
!byte 4, 2, $3B ; 3-note chord
!byte 4, 1, $47
!byte 4, 3, $27
!byte 6, 3, $27 ; 2-note chord
!byte 6, 1, $47
!byte 8, 1, $47 ; 3-note chord
!byte 8, 2, $3B
!byte 8, 3, $27
!byte 10, 2, $3B ; Single
!byte 12, 1, $47 ; 2-note chord
!byte 12, 3, $27
!byte 14, 2, $3B ; 3-note chord
!byte 14, 1, $47
!byte 14, 3, $27
!byte 16, 1, $47 ; 3-note chord
!byte 16, 2, $3B
!byte 16, 3, $27
!byte 18, 3, $27 ; 2-note chord
!byte 18, 2, $3B
!byte 20, 1, $47 ; 2-note chord
!byte 20, 2, $3B
!byte 22, 2, $3B ; 3-note chord
!byte 22, 1, $47
!byte 22, 3, $27
!byte 24, 1, $47 ; 3-note chord
!byte 24, 2, $3B
!byte 24, 3, $27
!byte 26, 1, $47 ; Single
!byte 28, 2, $3B ; 2-note chord
!byte 28, 3, $27
!byte 30, 1, $47 ; 3-note chord
!byte 30, 2, $3B
!byte 30, 3, $27
!byte 32, 1, $47 ; 3-note chord
!byte 32, 2, $3B
!byte 32, 3, $27
!byte 34, 2, $3B ; 2-note chord
!byte 34, 3, $27
!byte 36, 1, $47 ; 2-note chord
!byte 36, 2, $3B
!byte 38, 3, $27 ; 3-note chord
!byte 38, 1, $47
!byte 38, 2, $3B
!byte 40, 2, $3B ; 3-note chord
!byte 40, 1, $47
!byte 40, 3, $27
!byte 42, 1, $47 ; Single
!byte 44, 2, $3B ; 2-note chord
!byte 44, 3, $27
!byte 46, 1, $47 ; 3-note chord
!byte 46, 2, $3B
!byte 46, 3, $27
!byte 48, 1, $47 ; 3-note chord
!byte 48, 2, $3B
!byte 48, 3, $27
!byte 52, 2, $3B ; 2-note chord
!byte 52, 1, $47
!byte 56, 1, $47 ; 3-note chord
!byte 56, 2, $3B
!byte 56, 3, $27
!byte 60, 3, $27 ; 2-note chord
!byte 60, 2, $3B
!byte 62, 1, $47 ; Final 3-note chord
!byte 62, 2, $3B
!byte 62, 3, $27
!byte $FF
; ============================================================================
; Song 6 - Fusion (130 BPM)
; ============================================================================
; Combines basic rhythm, syncopation, and polyrhythms
; Tests all skills developed throughout the game
; --- EASY: Learning mixed techniques (16 notes) ---
song6_easy:
!byte 0, 1, $47 ; Strong beat
!byte 4, 2, $3B ; Basic rhythm
!byte 8, 1, $47
!byte 8, 2, $3B ; Simple 2-note chord
!byte 14, 3, $27 ; Off-beat (syncopation)
!byte 16, 1, $47 ; Strong beat
!byte 22, 2, $3B ; Off-beat
!byte 24, 3, $27
!byte 28, 1, $47
!byte 32, 1, $47
!byte 32, 3, $27 ; 2-note chord
!byte 38, 2, $3B ; Off-beat
!byte 40, 1, $47
!byte 46, 3, $27 ; Off-beat
!byte 48, 2, $3B
!byte 56, 1, $47 ; Final note
!byte $FF
; --- NORMAL: Balanced mix (32 notes) ---
song6_normal:
; Section 1: Basic + syncopation
!byte 0, 1, $47 ; Strong downbeat
!byte 2, 2, $3B ; Quick follow
!byte 6, 3, $27 ; Off-beat
!byte 8, 1, $47 ; Beat
!byte 10, 2, $3B
!byte 14, 1, $47 ; Syncopation
; Section 2: Add chords
!byte 16, 1, $47 ; 2-note chord
!byte 16, 2, $3B
!byte 20, 3, $27
!byte 22, 2, $3B ; Off-beat
!byte 24, 1, $47
!byte 26, 3, $27
!byte 30, 2, $3B ; Off-beat
; Section 3: Full mix
!byte 32, 1, $47 ; 3-note chord
!byte 32, 2, $3B
!byte 32, 3, $27
!byte 36, 1, $47
!byte 38, 2, $3B ; Off-beat
!byte 40, 3, $27
!byte 44, 1, $47
!byte 46, 2, $3B ; Off-beat
; Section 4: Climax
!byte 48, 1, $47 ; 2-note chord
!byte 48, 3, $27
!byte 50, 2, $3B
!byte 52, 1, $47
!byte 54, 3, $27 ; Off-beat
!byte 56, 1, $47 ; 2-note chord
!byte 56, 2, $3B
!byte 58, 3, $27
!byte 60, 1, $47
!byte 62, 2, $3B ; Final off-beat
!byte $FF
; --- HARD: All techniques combined (56 notes) ---
song6_hard:
; Section 1: Fast basic + syncopation
!byte 0, 1, $47
!byte 1, 2, $3B
!byte 2, 3, $27
!byte 3, 1, $58 ; Off-beat
!byte 4, 2, $3B
!byte 6, 1, $47 ; Off-beat
!byte 7, 3, $27
!byte 8, 1, $47 ; 2-note chord
!byte 8, 2, $3B
!byte 10, 3, $27
!byte 11, 1, $47 ; Syncopation
!byte 12, 2, $3B
!byte 14, 1, $58 ; Off-beat
!byte 15, 3, $27
; Section 2: Chord-heavy
!byte 16, 1, $47 ; 3-note chord
!byte 16, 2, $3B
!byte 16, 3, $27
!byte 18, 1, $58
!byte 19, 2, $3B ; Off-beat
!byte 20, 1, $47 ; 2-note chord
!byte 20, 3, $27
!byte 22, 2, $3B ; Off-beat
!byte 23, 1, $47
!byte 24, 2, $3B ; 2-note chord
!byte 24, 3, $27
!byte 26, 1, $58
!byte 27, 2, $3B ; Off-beat
!byte 28, 1, $47
!byte 30, 3, $27 ; Off-beat
; Section 3: Maximum challenge
!byte 32, 1, $47 ; 3-note chord
!byte 32, 2, $3B
!byte 32, 3, $27
!byte 34, 1, $58 ; 2-note chord
!byte 34, 2, $3B
!byte 35, 3, $27 ; Off-beat
!byte 36, 1, $47
!byte 38, 2, $3B ; Off-beat
!byte 39, 3, $27
!byte 40, 1, $47 ; 3-note chord
!byte 40, 2, $3B
!byte 40, 3, $27
!byte 42, 1, $58
!byte 43, 2, $3B ; Off-beat
!byte 44, 3, $27 ; 2-note chord
!byte 44, 1, $47
!byte 46, 2, $3B ; Off-beat
; Section 4: Grand finale
!byte 48, 1, $47 ; 3-note chord
!byte 48, 2, $3B
!byte 48, 3, $27
!byte 50, 1, $58
!byte 51, 2, $3B ; Off-beat
!byte 52, 1, $47 ; 2-note chord
!byte 52, 3, $27
!byte 54, 2, $3B
!byte 55, 1, $47 ; Off-beat
!byte 56, 1, $47 ; Final 3-note chord
!byte 56, 2, $3B
!byte 56, 3, $27
!byte $FF
; ----------------------------------------------------------------------------
; Note Arrays
; ----------------------------------------------------------------------------
note_track:
!fill MAX_NOTES, 0
note_col:
!fill MAX_NOTES, 0
note_freq:
!fill MAX_NOTES, 0
; ----------------------------------------------------------------------------
; Game Variables
; ----------------------------------------------------------------------------
score_lo: !byte 0
score_hi: !byte 0
miss_count: !byte 0
perfect_count: !byte 0
good_count: !byte 0
health: !byte 0
combo: !byte 0
max_combo: !byte 0
new_high_score: !byte 0 ; Flag: 1 if current score beat high score
; ----------------------------------------------------------------------------
; High Score Table (6 songs x 3 difficulties = 18 entries, 2 bytes each)
; Index = (song * 3) + difficulty
; ----------------------------------------------------------------------------
high_scores:
; Song 1 (First Steps)
!word 0 ; Easy high score
!word 0 ; Normal high score
!word 0 ; Hard high score
; Song 2 (Upbeat Groove)
!word 0 ; Easy
!word 0 ; Normal
!word 0 ; Hard
; Song 3 (Speed Rush)
!word 0 ; Easy
!word 0 ; Normal
!word 0 ; Hard
; Song 4 (Off-Beat)
!word 0 ; Easy
!word 0 ; Normal
!word 0 ; Hard
; Song 5 (Chordstorm)
!word 0 ; Easy
!word 0 ; Normal
!word 0 ; Hard
; Song 6 (Fusion)
!word 0 ; Easy
!word 0 ; Normal
!word 0 ; Hard
; ============================================================================
; END OF SID SYMPHONY - UNIT 32 (PHASE 2 COMPLETE)
; ============================================================================
What You’ve Learnt
- Extending existing systems - Adding functionality to existing routines
- Colour pulse tables - Pre-defined colour sequences for smooth animation
- Index calculation - Converting a countdown to a table index
- Multi-location updates - Efficiently updating multiple screen positions
- Visual rhythm feedback - How visual cues enhance timing gameplay
What’s Next
With the hit zones pulsing to the beat, Unit 37 adds celebration effects for perfect hits. When timing is spot-on, the game should reward you with visual fanfare.
What Changed
Unit 35 → Unit 36
+36-9
| 1 | 1 | ; ============================================================================ | |
| 2 | - | ; SID SYMPHONY - Unit 35: Attract Mode | |
| 2 | + | ; SID SYMPHONY - Unit 36: Hit Zone Animation | |
| 3 | 3 | ; ============================================================================ | |
| 4 | - | ; When the title screen sits idle, the game demonstrates itself. This creates | |
| 5 | - | ; a "arcade cabinet" feel where passersby can see the game in action. | |
| 4 | + | ; The hit zone pulses to the beat, creating visual rhythm that helps players | |
| 5 | + | ; time their inputs. This visual feedback makes the game feel more alive. | |
| 6 | 6 | ; | |
| 7 | 7 | ; New features: | |
| 8 | - | ; - Idle timer counts frames without input | |
| 9 | - | ; - After 5 seconds idle, switches to attract/demo mode | |
| 10 | - | ; - Demo plays through Song 1 automatically | |
| 11 | - | ; - "PRESS ANY KEY" overlay appears | |
| 12 | - | ; - Any input returns to normal title screen | |
| 8 | + | ; - Hit zone colour pulses brighter on each beat | |
| 9 | + | ; - Animation synced to song tempo via beat_pulse variable | |
| 10 | + | ; - Smooth fade from bright to normal between beats | |
| 11 | + | ; - Visual cue helps players anticipate timing | |
| 13 | 12 | ; | |
| 14 | 13 | ; Controls: Z = Track 1, X = Track 2, C = Track 3 | |
| 15 | 14 | ; Up/Down = Song selection, Left/Right = Difficulty | |
| ... | |||
| 717 | 716 | !byte 0 | |
| 718 | 717 | | |
| 719 | 718 | version_text: | |
| 720 | - | !scr "phase 3 v0.3" | |
| 719 | + | !scr "phase 3 v0.4" | |
| 721 | 720 | !byte 0 | |
| 722 | 721 | | |
| 723 | 722 | ; ---------------------------------------------------------------------------- | |
| ... | |||
| 3644 | 3643 | ; ---------------------------------------------------------------------------- | |
| 3645 | 3644 | ; Shows a pulsing indicator that helps players feel the rhythm. | |
| 3646 | 3645 | ; Pulses bright on downbeat, fades through the beat. | |
| 3646 | + | ; Also pulses the hit zone colours for visual timing cues. | |
| 3647 | 3647 | | |
| 3648 | 3648 | update_beat_marker: | |
| 3649 | 3649 | lda beat_pulse | |
| ... | |||
| 3659 | 3659 | sta COLRAM + (HIT_ROW * 40) + 19 ; Centre of hit zone | |
| 3660 | 3660 | lda #$51 ; Filled circle character | |
| 3661 | 3661 | sta SCREEN + (HIT_ROW * 40) + 19 | |
| 3662 | + | | |
| 3663 | + | ; ---------------------------------------- | |
| 3664 | + | ; Pulse hit zone colours (new in Unit 36) | |
| 3665 | + | ; ---------------------------------------- | |
| 3666 | + | lda beat_pulse | |
| 3667 | + | lsr | |
| 3668 | + | and #$03 | |
| 3669 | + | tax | |
| 3670 | + | lda hitzone_pulse_cols,x | |
| 3671 | + | sta COLRAM + (TRACK1_ROW * 40) + HIT_ZONE_COLUMN | |
| 3672 | + | sta COLRAM + (TRACK2_ROW * 40) + HIT_ZONE_COLUMN | |
| 3673 | + | sta COLRAM + (TRACK3_ROW * 40) + HIT_ZONE_COLUMN | |
| 3674 | + | | |
| 3662 | 3675 | rts | |
| 3663 | 3676 | | |
| 3664 | 3677 | beat_marker_dim: | |
| ... | |||
| 3667 | 3680 | sta COLRAM + (HIT_ROW * 40) + 19 | |
| 3668 | 3681 | lda #$57 ; Empty circle character | |
| 3669 | 3682 | sta SCREEN + (HIT_ROW * 40) + 19 | |
| 3683 | + | | |
| 3684 | + | ; Reset hit zone to normal colour | |
| 3685 | + | lda #HIT_ZONE_COL ; Yellow (7) | |
| 3686 | + | sta COLRAM + (TRACK1_ROW * 40) + HIT_ZONE_COLUMN | |
| 3687 | + | sta COLRAM + (TRACK2_ROW * 40) + HIT_ZONE_COLUMN | |
| 3688 | + | sta COLRAM + (TRACK3_ROW * 40) + HIT_ZONE_COLUMN | |
| 3689 | + | | |
| 3670 | 3690 | rts | |
| 3671 | 3691 | | |
| 3672 | 3692 | beat_colours: | |
| ... | |||
| 3674 | 3694 | !byte 7 ; Yellow | |
| 3675 | 3695 | !byte 5 ; Green | |
| 3676 | 3696 | !byte 11 ; Dark grey (dimmest) | |
| 3697 | + | | |
| 3698 | + | ; Hit zone pulse colours - bright to normal | |
| 3699 | + | hitzone_pulse_cols: | |
| 3700 | + | !byte 1 ; White (brightest on beat) | |
| 3701 | + | !byte 13 ; Light green | |
| 3702 | + | !byte 7 ; Yellow | |
| 3703 | + | !byte 7 ; Yellow (normal) | |
| 3677 | 3704 | | |
| 3678 | 3705 | ; ---------------------------------------------------------------------------- | |
| 3679 | 3706 | ; Check Keys |