How it’s made #retrocomputing
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Thomas 🔭✨ (thomasfuchs@hachyderm.io)'s status on Friday, 04-Aug-2023 22:13:15 JST Thomas 🔭✨ -
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Leo :elixir: (shooboo@hachyderm.io)'s status on Friday, 04-Aug-2023 22:25:52 JST Leo :elixir: @thomasfuchs look behind you!
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Thomas 🔭✨ (thomasfuchs@hachyderm.io)'s status on Friday, 04-Aug-2023 22:26:05 JST Thomas 🔭✨ Early PC graphics cards (MDA, CGA, EGA) used mainly a hybrid of analog/digital signals (RGBI) to talk to monitors, so I gotta find my CGA to analog video adapter to test this thing (I don’t have a RGBI monitor, believe it not!)
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Coy Meeks (coymeeks@hachyderm.io)'s status on Friday, 04-Aug-2023 22:59:50 JST Coy Meeks @thomasfuchs dude swinging from the chandelier FTW
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Thomas 🔭✨ (thomasfuchs@hachyderm.io)'s status on Saturday, 05-Aug-2023 05:15:53 JST Thomas 🔭✨ @jyrgenn Yes, the color in CGA is purely digital, but it also sends two sync signals which I would call analog.
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Jyrgen N (jyrgenn@mas.to)'s status on Saturday, 05-Aug-2023 05:15:54 JST Jyrgen N @thomasfuchs IIRC MDA, CGA, EGA were pure digital, only VGA used analog RGB signals on the monitor interface. But then I could be wrong, after all this is 35 years ago.
(We got VGA monitors in our university PC pools starting 1988. That was where I spent most of my time if not working, studying, or sleeping. Or at least it felt that way.) -
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Thomas 🔭✨ (thomasfuchs@hachyderm.io)'s status on Saturday, 05-Aug-2023 06:07:48 JST Thomas 🔭✨ @jyrgenn EGA is really the same as CGA, it’s just that the card had more memory so could do 16 colors in higher resolutions. The only difference in the signal is that it had two sync frequencies (the normal CGA one and a higher one for the 350 line ones).
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Jyrgen N (jyrgenn@mas.to)'s status on Saturday, 05-Aug-2023 06:07:49 JST Jyrgen N @thomasfuchs Ah ok. Could be very similar for MDA, I guess; dunno about EGA.
EGA was actually the first I saw at all (on a PC, I mean, not counting the PET in the 70s and the block mode terminals on the uni data center's Cybers).
I had a slightly twisted beginning of computing experience, going from 8 bits to 60 and then 16. Finally felt really comfortable when I reached 32 (VAXen, Suns etc.).
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