![]() Blizzard popularized the use of a non-standard mode of 320x240 with 256 colors called Mode-X. You could poll a port or memory address (I forget which) to know when the monitor was in the vertical blanking period (v-sync) and do all your screen updates during this period. This meant you could store 4 full screens of imagery in VRAM and adjust a window offset to pan across the buffer. The common resolution was 320x200 with a 256 color palette, called mode-13, triggered by writing certain values to a specific memory location. The typical graphics card of the 386/486 era was a VGA card with 256Kb of VRAM. Independent of language, the first step one often took as a DOS developer was to create a graphics library. Perhaps useful, my recollection of attempting to program a DOS game - somewhat technical.
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