Casio OR-208
This page was last modified 15:13, 26 June 2021 by Mars2000you. Based on work by Gdx and Rderooy.



The expansion OR-208 is usable only on the MSX1 Casio PV-7 and its clone, the Sanno SPCmk-II. This cartridge expands the RAM to 16kB.

Product name is "8KB Kakuchou RAM Cartridge".

This RAM cartridge contains in fact 16kB RAM located on page 3 (E000h~FFFFh). It's the Bios that replaces Casio PV-7 8kB RAM by the 16kB RAM of this cartridge by scrutinizing the slots. So this RAM expansion is almost useless on other MSXs.

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


Casio OR-208 box
Casio OR-208 cartridge
Casio OR-208 cartridge
Casio OR-208 PCB
Casio OR-208 PCB-back

System Requirements