IBM Color Graphics Adapter: signals, sources and receivers.
Questions tagged [cga]
23 questions
33
votes
3 answers
How did the IBM 5153 color display detect and modify the signal to make low-intensity yellow into "brown"?
The IBM CGA video card generated 16 colours indicated via four binary TTL signals: R, G, B and I (red, green, blue and intensity). This was not an entirely linear transformation: in particular, RGBI=1100, or "low-intensity yellow" appeared not dark…
cjs
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2 answers
Motorola 6845 and bitwise graphics
I'm curious about how graphics were drawn on systems using the Motorola 6845. I understand this was used in the CGA? If so, did the 6845 really work bitwise, was the bitwise graphics entirely separate, or did they use changing character sets on the…
Maury Markowitz
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0
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1 answer
VGA to CGA (RGBI) signal
Does anybody know how I can go from an analog RGB signal to a TTL RGBI signal?
Is there a good circuit for this out there somewhere?
user11397
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