MK MSX Memory Mapper
This page was last modified 11:31, 8 June 2020 by Gdx. Based on work by Mars2000you and Grauw.



This Memory Mapper cartridge is a standard expansion memory that use DRAM chips. It was made by MK Public Domain and sold in Netherlands.

The cartridge exists in 3 versions: 1024kB, 2048kB and 4096kB. All three use the same PCB.


MK MSX Memory Mapper 1024kB
MK MSX Memory Mapper 1024kB PCB

Minimum System Requirements

  • MSX2 computer, one free slot cartridge

Note: As all standard Memory Mapper, this cartridge is not supported by MSX1 computers except with Nextor or a MSX-DOS2 unbridled (like Sunrise CF interface). On MSX1 without Nextor, we need to manually initialize pages order of the mapper from basic before it can be used.


  • BMMS (Bigger Memory Mapper Selector)
  • CHKMEM.BIN (Utility that displays the slot of RAM, Memory Mapper and MegaRAM by LARK)
  • Mapper Info (by Yukke)
  • MEGA16.COM (loader for megaroms with 16k mapper)
  • MEMTEST.COM (RAM of Memory Mapper tester by Masatoshi Fujimoto)
  • TESTMAP.COM (RAM of Memory Mapper tester by Marteen)
  • SofaRom (MegaRoms and Roms loader by Louthrax)