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Open Source PC104 Soundcard

I wanted to build a mini DOS gaming PC (which has been discussed here : https://www.vogons.org/viewtopic.php?f=5&t=78370) and frustrated by the cost and lack of availability of PC/104 soundcards, I decided to make my own. The original revision had a few issues (incorrect gameport pinout, lack of …

Re: EGA deep dive

What about the Boca cards? Do they work the same as the Paradise? I don't have Paradise EGA, but I do have Boca. I'm not sure, but if I run Rambo 3 in Boca mode on my Paradise I get exactly the same result (low-res, inverted vsync, 17.8KHz hsync). So the Boca and Paradise cards must have very …

Re: EGA deep dive

Paradise EGA can do 64 colours in lowres on a 5154? That deserves more investigation. It certainly does appear so. I don't have a 5154 to test it on, but I just built an MCE2VGA. It does 64-color mode selection based on VSYNC polarity just like the 5154 does, and doesn't (AFAIK) have a manual …

EGA deep dive

I decided to take a deep dive into the EGA capabilities of my Amstrad PC1640. Had lots of fun along the way - built a circuit to convert CGA/EGA to analog for the GBS-8200, using an EEPROM for the encoding logic (got the idea from the IBM5154 service manual). Also got EGA hi-res mode working on the …

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