VRAM board for Yamaha CX5MII

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By Grauw

Ascended (10581)

Grauw의 아바타

26-07-2015, 17:28

Ok Smile.

By Alexey

Guardian (3385)

Alexey의 아바타

27-07-2015, 19:41

Btw, based on some pieces of advice from hardware gurus I improved the board's design a bit.

Please contact me if you need Eagle CAD sources and Gerber files.

By Grauw

Ascended (10581)

Grauw의 아바타

27-07-2015, 20:20

What has changed? The grounding?

By Alexey

Guardian (3385)

Alexey의 아바타

27-07-2015, 20:22

Grauw wrote:

What has changed? The grounding?

Yes, grounding and also capacitors are connected in a better way making them more effective.

By Alexey

Guardian (3385)

Alexey의 아바타

09-08-2015, 09:25

Grauw wrote:

Yeah I received a stack yesterday. I’ll send a couple your way next week.

I am finally home. So you can send me the board. Thanks in advance. Smile

By switch

Rookie (27)

switch의 아바타

09-08-2015, 20:54

Hi! I would like to buy one. How much does it cost?

By Grauw

Ascended (10581)

Grauw의 아바타

13-08-2015, 20:45

switch: Mail me your address and I’ll send you one for shipping cost.

By Alexey

Guardian (3385)

Alexey의 아바타

19-08-2015, 17:15

The boards arrived from the Netherlands (thanks, Laurens). Need to assemble and test them in my Yamaha YIS503II MSX1...

By Grauw

Ascended (10581)

Grauw의 아바타

19-08-2015, 19:22

I haven’t assembled mine yet, so I’m curious to hear.

By Alexey

Guardian (3385)

Alexey의 아바타

22-08-2015, 19:08

I don't get it. I assembled the board, put *464 chips inside, connected CS1 (CS0 is routed to the board). The computer starts, but the TESTRAM still shows 16kb of VRAM. Is there any other way to verify that the memory is expanded? Or is there a problem with the design?

Btw, good thing is that the board fits perfectly even with the RAM chips installed in sockets.

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