MSX Tier 2: PEEK, POKE and BIOS Calls

The MSX BIOS makes hardware safer — but not slower.

You’ll:

• Use POKE to write directly to VRAM and key hardware registers
• Explore the BIOS CALL commands and what they abstract
• Call assembly routines from BASIC using USR
• Understand how MSX hides hardware differences behind its firmware

Tier 2 is about stretching BASIC as far as it can go — and then sneaking into machine code.

Lessons in this Tier