Hyperfrog
Member
I have a CGA/MDA graphics card that I set to CGA. A color composite monitor is connected to the RCA output jack labeled "COLOR". On the motherboard (XT), switches 5 & 6 are set to ON and OFF respectively (Color 80 x 25), while the switch on the graphics card is set to CGA (the other position being MDA).
It works fine, but color is disabled in the 80 column text mode, i.e. colors are displayed as levels of gray. Why is that so? I do have color when I play games. I also have color when I set the DOS display MODE to CO40.
Here's a picture of my card: http://radikal.ru/F/s54.radikal.ru/i145/1001/08/ea8b50495a19.jpg.html. (Well, this is not my card, but they're the same.)
How can I enable color output in the 80 column text mode?
In addition, if you look at the picture, you will notice there are two 41464 memory chips (64k x 4), which means the card has 64kB of video RAM. Why is that so? CGA needs only 16kB. Could this card be able to emulate Hercules graphics? Or Tandy graphics?
Thanks,
Christian
It works fine, but color is disabled in the 80 column text mode, i.e. colors are displayed as levels of gray. Why is that so? I do have color when I play games. I also have color when I set the DOS display MODE to CO40.
Here's a picture of my card: http://radikal.ru/F/s54.radikal.ru/i145/1001/08/ea8b50495a19.jpg.html. (Well, this is not my card, but they're the same.)
How can I enable color output in the 80 column text mode?
In addition, if you look at the picture, you will notice there are two 41464 memory chips (64k x 4), which means the card has 64kB of video RAM. Why is that so? CGA needs only 16kB. Could this card be able to emulate Hercules graphics? Or Tandy graphics?
Thanks,
Christian
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