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Re: How hard would it be to make a CGA card?

Posted on 2018-07-25, 20:13

reenigne wrote: This is the point where an oscilloscope would really come in handy, so that you can see which lines carry what signals in COLOR mode. Literally on another tab I'm looking for oscilloscopes 😀 I have no idea what I need though. (and how much does one costs)

Re: How hard would it be to make a CGA card?

Posted on 2018-07-25, 19:58

hercules won't work via composite port like root42 says try some cga game I tried running Prince of Persia in CGA mode, but it does not allow it when the card is on MONO (the game says "Graphics mode not available") . and when the card in on COLOR, it allows CGA mode, but the composite output does …

Re: How hard would it be to make a CGA card?

Posted on 2018-07-25, 19:40

Hm. Are you trying to run Hercules and CGA at the same time? It looks like the right monitor shows Hercules. Have you tried running only CGA and setting the jumper to Color? Right now it's on Mono in your picture. I did, but I double checked now again. When the jumper is on COLOR, nothing is …

Re: How hard would it be to make a CGA card?

Posted on 2018-07-25, 19:19

Well, some progress has been made! I bought the needed resistors and transistor and soldered them along with pins to P1, and made a female rca cable with sockets that would go directly to pin 7 and 2 (ground). Turned on the computer and it didn't blow up!! First goal achieved! Furthermore, the …

Re: How hard would it be to make a CGA card?

Posted on 2018-07-23, 15:23

And yeah, the emitter is connected to the rightmost pin of J1, which when closed with the middle pin, connects to pin 7 of the RGBI connector... I'm getting excited 😀 Say it works, and pin 7 starts outputting a video signal, is it a simple matter of connecting an RCA header to it?

Re: How hard would it be to make a CGA card?

Posted on 2018-07-23, 14:27

Well... you could still make your own CGA card from scratch, just for fun, even if you don't actually need to! You'd surely need a scope to debug it... (Though I'd have said that about cloning an Adlib card as well - impressive that you did that with no scope!) Oh, I did not design the board. I …

Re: How hard would it be to make a CGA card?

Posted on 2018-07-23, 12:18

If you're not bothered about the colours being accurate and you have (or find) a CGA card with an RGBI output, it's a pretty simple circuit to go from RGBI to monochrome composite. I have a card with a 9 pin female output (and an LPT port). not sure what is it.. it drives a monochrome monitor with …

Re: How hard would it be to make a CGA card?

Posted on 2018-07-23, 11:32

I must admit that one of my reasons toward this project is the fact that I own a green monochrome monitor with only composite input. I really want a card to put in my 286 that could drive it 😀 AFAIK my best option is a CGA card. So, to me, the color part is not a big issue...

How hard would it be to make a CGA card?

Posted on 2018-07-22, 15:18

After dipping my toes in building my own retro card, with the Adlib clone, I wonder how complicated would it be to create a CGA card from scratch? I'm not an electronics expert (pff not even a beginner..) but it seems that the only "proprietary" part would be a ROM chip with the BIOS/Character map …

Re: Adlib box and content high res scans

Posted on 2018-06-02, 18:52

Hi guys. I'm making for myself ( for now.. ) Ah, yeah... for now. So once someone provides a very high quality scan, we can see those cards incl. boxes made by you on ebay for some 1.000 bucks..? The answer is no. My intention is to make one to myself, and if it will turn out good and not too …

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