Yamaha SRE-01
This page was last modified 14:06, 2 March 2018 by Rderooy. Based on work by Gdx and Mars2000you and others.


The module SRE-01 is an expansion of 32kB RAM combined with an slotexpander. This module was manufactured and sold by Yamaha. Product name is 32K RAM/Expansion Slot Unit.

It is only for a Yamaha or derivative computer (Victor, Sakhr) with 60 pin expansion slot, It's actually the slot 3 that is therefore expanded: slot 3-0 becomes an extra cartridge slot and slot 3-1 hosts the extra RAM.

On one side you have the 60 pin connector, on the other side an Expansion Slot Unit with a normal MSX 50 pin connector.

The RAM is placed in banks 2 and 3 (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 pages itself at start up is the best choice.

Official price was ¥12,800


Yamaha SRE-01
Yamaha SRE-01 inside


Yamaha SRE-01 Service Manual