Author
| Help needed with 1Mb 30 pin Simm in 8250
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luppie
msx lover
Posts: 75 |  Posted: September 03 2008, 20:24 |
Hey,
Finaly my PCB's arrived for my prototype 1Mb SIMM expansion. Cause Erikie talked about using an old SIMM Socket for easy SIMM replacement I had a bright idea to build the logics on a PCB together with the SIMM Socket.
Here is my prototype:
The 40 pin connector is a standard HDD connector, so I now only have to remove the memory from my 8250 and 2 resistors.
After that I have to solder a standard HDD 40pins cable to the mainboard of the MSX and plug it onto my PCB. |
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jltursan
msx professional
Posts: 849 | Posted: September 03 2008, 21:51 |
Oh, seems a neat design!. Have you already tested it? and if it works fine, could more of these PCBs be ordered?. I would love to get a pair of them  |
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luppie
msx lover
Posts: 75 | Posted: September 03 2008, 22:21 |
I'm planning on testing it this weekend.
If it works out I'll publish the schematics and PCB design.
The price of the PCB was $ 5,60 a piece, but had to pay $ 25,- setup costs, so it would be good to order for example 10 or 20 at a time.
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jltursan
msx professional
Posts: 849 | Posted: September 04 2008, 14:42 |
Count with me to order a couple of PCBs!
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luppie
msx lover
Posts: 75 | Posted: September 05 2008, 00:05 |
Saterday i'm placing it into a fresh unmodded NMS8255 to see if it works.
If it works i'm willing to set up a sale for these PCB's
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