Toshiba HX-M250
This page was last modified 01:26, 22 December 2021 by Gdx. Based on work by Mars2000you and Rderooy.


The Toshiba HX-M250 is a standard expansion of 16kB RAM. Product name is Toshiba RAM Cartridge 16KB.

Its RAM is placed on page 2 (8000h~BFFFh). This allows you to upgrade an MSX from 16 Kb to 32 Kb. It is mainly useful for BASIC programs since you will be able to run the largest programs. System base memory and expansion will be in different locations but this causes few compatibility issues with software which blindly assumes all memory is in one location on MSXs with 16kB.

If you are looking for a memory expansion nowaday we recommend to buy another standard expansion of 64kB or even better a Memory Mapper cartridge MSX1 compatible that initializes its segments itself.

Brand Toshiba
Model HX-M250
Year 1984
Region Japan
Launch price ¥9.000
Package content


Toshiba HX-M250 packaging
Toshiba HX-M250
Toshiba HX-M250

Minimum System Requirements

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