CGA is an abbreviation for Color Graphics Adapter. It is a type of PC video display adapter introduced by IBM in 1981, that supports text and graphics. Text is supported at a maximum resolution of 80 x 25 characters in 16 colors with a character box of 8 x 8 pixels. Graphics is supported at a maximum resolution of 320 x 200 pixels in 16 colors or 640 x 200 pixels in 2 colors. The CGA outputs a TTL (digital) signal with a horizontal scanning frequency of 15.75 kHz, and supports TTL color or NTSC composite displays.
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