T.N.S. Addram
This page was last modified 11:49, 8 June 2020 by Gdx. Based on work by Mars2000you and Rderooy.



AddRAM is an expansion of 4MByte for MSX2 or newer made by Terra Network System (1994~99). The cartridge contacts are gold plated.

AddRAM may not preserve data in its memory when you press PAUSE for more than a few seconds on a lot of MSX.



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)

External Links