1024kb memory upgrade for Yamaha MSX2 YIS503

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By Alexey

Guardian (2456)

Alexey's picture

24-03-2017, 17:56

Tabajara-Labs wrote:

Mind sharing the desing, so I can make some?

It's not my design. The board was designed by Kamil Karimov:

http://caro.su/msx/mem4msx.htm

By Tabajara-Labs

Expert (93)

Tabajara-Labs's picture

24-09-2017, 08:55

Thanks Alexey. Me and Gradius (www.msxpro.com) made a brazilian version of the board

This is a 2MB board using 512K SRAM, and there is also a (not built) 2MB expander, to have internal 4MB mapper ram

By Alexey

Guardian (2456)

Alexey's picture

24-09-2017, 11:41

Impressive! Is it the same size as the original RAM board? Does it have a hole for the plastic holder?

Btw, I see the places for blocking capacitors, but no capacitors themselves. Better to put them on to avoid interference.

By Grauw

Ascended (8515)

Grauw's picture

24-09-2017, 17:55

Just to affirm, these caps are decoupling capacitors, right? I learned something new :D, always wondered why all those caps were there next to every chip.

By alexito

Hero (555)

alexito's picture

24-09-2017, 18:43

Awesome!

There are a place where I can order one piece for my Yamaha or we need to wait for that?

By Tabajara-Labs

Expert (93)

Tabajara-Labs's picture

24-09-2017, 19:26

Yep, same size as the original board. The capacitors weren't installed for a quick test, it was 03:00am and I was anxious to see it working Smile

By Tabajara-Labs

Expert (93)

Tabajara-Labs's picture

24-09-2017, 19:27

I have about 8 boards which will be sold this week. I'm still doing all kind of tests I can do, and later will release a kit with the vram board and this ram board. Stay tuned! Big smile

By Tabajara-Labs

Expert (93)

Tabajara-Labs's picture

06-11-2017, 12:25

Ok people, boards are ready to be sold. I made all possible tests and it is working flawlessly.

I have 7 boards to sell

  • Empty board - (euro)25
  • Populated board less SRAMs - (euro)45

Prices are ex-shipping. Empty boards will be sent into a padded envelope. Populated boards will be sent into a box, so it will be reflected on shipping. Origin is Sao Paulo, Brazil, 02474-000. Each order will get a free VRAM board. Since these VRAM boards were drawn by Alexey, I have no right to sell them. I'm selling these mapper boards to recover the cost of modding the schematic, drawing them and producing them

After all the boards are sold, I'll release schematics/gerbers for everyone. Hope you all help me to recoup the production costs.

For buying and quoting shipping, please contact me in private. Thanks!

By alexito

Hero (555)

alexito's picture

06-11-2017, 17:55

Private message sent.

By Tabajara-Labs

Expert (93)

Tabajara-Labs's picture

06-11-2017, 18:01

Thanks Alex, just 5 avaiable

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