Addcom ADMSM 302
This page was last modified 18:47, 17 January 2021 by Mars2000you. Based on work by Gdx and Rderooy.


The Addcom ADMSM 302 is a standard expansion of 32kB. Full product name is Addcom Expansion 2 RAM Cartridge 32K.

Its RAM is placed on pages 0 and 1 (0000h~7FFFh). As such it is only useful to upgrade a 32kB MSX to 64kB. However the systems base memory and the expansion will be in different slots which can cause compatibility problems with some software that blindly assumes all memory to be in a single slot.

If you are looking for a memory expansion we recommend to buy another standard expansion. A 64kB RAM expansion, or even better a Memory Mapper cartridge that initializes its segments itself at start up is the best choice.


Addcom ADMSM 302 cartridge
Addcom ADMSM 302 cartridge back

Minimum System Requirements

  • MSX1 computer with 32kB RAM, one free slot cartridge