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CGA uses a 4-bit RGBI 16-color gamut, but not all colors are available at all times, depending on which graphics mode is being used. In the medium- and high-resolution modes, colors are stored at a lower bit depth and selected by fixed palette indexes, not direct selection from the full 16-color palette.
The Enhanced Graphics Adapter (EGA) supports all CGA modes and add three more: two 320×200 and 640×200 graphic modes, both with the full CGA 16-color palette (intended to be used with the same "digital RGB" CGA color monitor of 200 scan lines) and an extra 640×350 graphic mode with 16 colors chosen from a 6-bit RGB (64 colors) palette for ...
160 × 200 with 16 colors (equivalent to the graphical quality of many contemporary 8-bit home computers and games consoles, using the same 16 KB memory size and machine bandwidth as the original CGA modes, and analogous to/somewhat able to share graphics assets with CGA's "composite color" mode whilst remaining displayable on RGB monitors)
In case of adapters that also have native color capabilities, such as the CGA, this technique can be further expanded by forming patterns out of the built-in colors - this way, the "real" subcarrier generated by the hardware will interfere with the "fake" one residing within the pixel patterns, causing the display to interpret the result as new ...
Plantronics 320 × 200 with 16 colors graphics resolution, corrected for aspect ratio Plantronics 640 × 200 with 4 colors graphics resolution, corrected for aspect ratio. CGA compatible modes: 160 × 100 16 color mode (actual a text mode using , , and ) 320 × 200 in 4 colors from a 16 color hardware palette. Pixel aspect ratio of 1:1.2.
The Hercules graphics mode is similar to the CGA high-resolution (640 × 200) two-color mode; the video buffer contains a packed-pixel bitmap (eight pixels per byte, one bit per pixel) with the same byte format—including the pixel-to-bit mapping and byte order—as the CGA two-color graphics mode, and the video buffer is also split into ...
For color monitors, all seven CGA modes are supported. 80-column text mode resolution improved from the CGA's 640×200 to 640×350—shy of the 720×350 resolution achieved by Compaq. Three new graphics modes were added, including 16 colors simultaneously from a palette of 64 colors at 640×350 resolution (see EGA palettes ).
2-, 4-, 8-, 16- and 32-color standard graphic modes, EHB 64-color and HAM 4096-color enhanced modes; 2 to 64 color modes pick from a 4096-color master palette (4 bits for each of red, green, and blue), with 64 color mode constructed from 32 normally chosen colors plus a second set of 32 fixed at half the intensity of the first.