The widely used VGA mode was the MCGA : 320x200x256. When those kind of display were widely available the CGA and EGA were obsolete and the PC could start to kick Amiga and Atari ST standards out of the place. VGA could also display a 640x480x16 video mode. All those from a 262,144colour total palette (6x6x6 bits).
VGA could emulate all CGA and EGA modes. However, as VGA monitors no longer supported 15.7kHz signalsscan rates, CGA, EGA, and MCGA modes were line-doubled to match the monitor's capabilities.
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