video display standard
(foldoc) | display standard
display standards
video display standard
IBM and others have introduced a
bewildering plethora of graphics and text display standards
for IBM PCs. The standards are mostly implemented by
plugging in a video display board (or "graphics adapter")
and connecting the appropriate monitor to it. Each new
standard subsumes its predecessors. For example, an EGA
board can also do CGA and MDA.
With the PS/2, IBM introduced the VGA standard and built
it into the main system board motherboard. VGA is also
available as a plug-in board for PCs from third-party vendors.
Also with the PS/2, IBM introduced the 8514 high-resolution
graphics standard. An 8514 adapter board plugs into the PS/2,
providing a dual-monitor capability.
Graphics software had to support the major IBM graphics
standards and many non-IBM, proprietary standards for
displays. Either software vendors provided display drivers
or display vendors provided drivers for the software package.
In either case, switching software or switching display
systems was fraught with compatibility problems.
Display Resolution Colours Sponsor Systems
MDA 720x350 T 2 IBM PC
CGA 320x200 4 IBM PC
EGA 640x350 16 IBM PC
PGA 640x480 256 IBM PC
Hercules 729x348 2 non-IBM PC
MCGA 720x400 T
320x200 G 256 PS/2
VGA 720x400 T
640x480 G 16
SVGA 800x600 16 VESA
XVGA 1024x768 256 (IBM name: 8514)
T: text, G: graphics.
More colours are available from third-party vendors for some
display types.
See also MDA, CGA, EGA, PGA, Hercules, MCGA,
VGA, SVGA, 8514, VESA.
[What were the corresponding "mode" numbers"?]
(2011-03-20)
|