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Miro Prisma II Plus Nubus Graphiccard ...

franklyn

6502
I have a Miro Prisma II Plus, but I can't get it to work. I'm certain it's faulty. My NEC MultiSync 1970NX monitor supports sync-on-green, but I'm not getting any image. The graphics card should work with this monitor. I installed a composite sync to H/V sync converter on the graphics card, and the monitor powers on (the activity LED turns green), but the screen remains black – no RGB signal. The monitor's control panel shows the screen resolution that the card is capable of. So, the question is: what component on the graphics card is faulty? The IMOS G300 chip is quite expensive, and since @Bollle has published the entire GAL code, could I try swapping out the GAL chips one by one?

Does anyone have any ideas on what I should do?
 

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  • MIRO_Prisma2_Nubus.jpg
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  • Miro_Panel.jpg
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  • pinout.jpg
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  • M&S.jpg
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  • INMOS.jpg
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