For MSX of the first generation with less RAM
 
If the onboard RAM is a low cost MSX such as 8MB or 16MB, an error will occur when reading CAS because the RAM capacity is small. With this RAM card, you can upgrade the MSX1 to 64KB, which is the maximum. *Onboard RAM is passed.
 
Read the blog for the full story.
 
This product is available as a kit and fully assembled. A kit is being prepared right now to make the PCB different.
*Since RAM chips are now available at a lower price, the price has been significantly reduced than originally planned.