RAM Cart Socket

By Shinobi

Expert (122)

Аватар пользователя Shinobi

15-07-2020, 02:31

Hi ..

On my MSX AX-200, I noticed that the 5V and GND pins were shorted (I knew they were 5v and GND from the daughter board pins-a continuity test to the ICs of the daughter board showed me what was the 5v and GND) so I cleaned the socket, now they are not shorted.

Further test, I noticed the the pins in the socket, the two red ones are shorted together.
Also, the socket pins in blue are shorted together.
These are not shorted in the daughter board.

Is this normal?? what is the pinout for this socket??


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By gdx

Prophet (3664)

Аватар пользователя gdx

15-07-2020, 03:17

Probably the same as Yamaha MSXs.

Alexey has made a RAM expansion for this socket:

Can you take pictures of board?

By Shinobi

Expert (122)

Аватар пользователя Shinobi

15-07-2020, 03:33

I posted a picture, it won't appear.
Here's a facebook link of the photo

same here


By Alexey

Guardian (2851)

Аватар пользователя Alexey

15-07-2020, 11:03

I didn't design that RAM board, I only published the design after getting the permission from the author - Kamil Karimov (Caro). Btw, he is working on the 2MB version now.


There's also the mod to upgrade the standard 128kb RAM module to 256kb.