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Computer
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Platform
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PC, IBM compatible
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Video
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CGA
BIOS
CGA Hydra
CGA: Reading the current beam position with the lightpen latch (2009-10-16)
CGA: Why the 80-column text mode requires the border color to be set (2009-10-17)
Color Graphics Adapter (WHATVGA v2.00) (1995-09-29)
Color Graphics Adapter by Wikipedia (2023-02-14)
Colour Graphics Adapter Notes by John Elliott (2017-10-18)
HD6845R∕HD6845S CRT Controller (CRTC) by Hitachi
IBM
MC6845 CRT Controller (CRTC) (1977)