General RJ-102
This page was last modified 21:12, 17 January 2021 by Mars2000you. Based on work by Gdx and Rderooy.


The Paxon Kakuchou RAM cartridge RJ-102 is an expansion of 16kB RAM made and sold by General in 1983.

Its RAM is placed on page 2 (8000h~BFFFh). As such it is only useful to upgrade a 16kB MSX to 32kB. 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 pages itself at start up is the best choice.

Brand General
Type RJ-102
Year 1984
Region Japan
Official price ¥8.000
Package content


General R102 cartridge
General R102 cartridge back
General R102 cartridge

Minimum System Requirements

  • MSX1 computer with 16kB RAM, one free slot cartridge