pt 2

pt 3

pt 4

pt 5

pt 6

Does anyone know what the third connector is for? It isn't populated and neither are its components on Lxx.

Mini-DIN for composite output maybe? BTW it should be possible to create a simple resistor-based DAC to make it somewhat VGA-compatible. I did something llike that for CGA, except I used FPGA devkit that had VGA output with resistor DAC, and I also implemented correct brown color while at it, and manual V/H polarity switching, but otherwise it was pass-through. If that still doesn't work, put OSSC between that "VGA" and monitor to bring it up to correct frequencies. And while it seems like a lot of work, I had those on hand but no CGA/EGA monitor. At least I know my card works.

Deunan wrote on 2022-02-21, 16:53:

Mini-DIN for composite output maybe? BTW it should be possible to create a simple resistor-based DAC to make it somewhat VGA-compatible. I did something llike that for CGA, except I used FPGA devkit that had VGA output with resistor DAC, and I also implemented correct brown color while at it, and manual V/H polarity switching, but otherwise it was pass-through. If that still doesn't work, put OSSC between that "VGA" and monitor to bring it up to correct frequencies. And while it seems like a lot of work, I had those on hand but no CGA/EGA monitor. At least I know my card works.

Learning finnish sounds less bleak. 😀
Ok, I'm not touching this board before I'll be able to understand this 100%.

Nice card! Invest 6€ in a logic analyzer to see the picture 😉
https://www.youtube.com/watch?v=PPi47e0SOUg
https://www.youtube.com/watch?v=FvCjBuS9NBc&t=1s

6€ MCE2VGA replacement - CGA/EGA/HGC capture with logic analyzer

For the price, it's great. But otherwise it has rather bad sampling jitter - I guess clock rate is matched to 640 pixels so it looks OK-ish in games but terrible in text mode. And then even in graphics mode there seems to be issues with detecting edge of the picture when the entire screen is moving sideways...

Yes, it has some erros in text mode with 640 pixels buts its readable.

In graphics mode 320x200 its 100% accurate and playable. The scrolling artifacts you noticed are related to Commander Keen and are well known.

But you need a fast PC.

Whatever, there is no cheaper way to get a EGA picture on your screen.

I love you people!
I mean it 😀

I used this 286 for a lot of games and tons of memories of many games I played are popping up.
Transparent like those cheap SBs 😀

Hi @nexxen - I have posted more pics of the compaq deskpro 286 here
Compaq Deskpro 286

😀

Moravec wrote on 2022-02-23, 15:38:

Hi @nexxen - I have posted more pics of the compaq deskpro 286 here
Compaq Deskpro 286

😀

Appreciated!!!