Re: Trackstar video problem.

[pausch@saaf.se (Paul Schlyter)]

In article <40be953e$1@news.uow.edu.au>,
David Wilson  <david@uow.edu.au> wrote:
>"Frank Townsend" <ftownsen@nospam.net> writes:
>>The manual actually specifies a "color or TTL monochrome monitor" and
>>indicates that by "color" it means RGB.
>
>>In the setup screens the monitor choices are "color or composite monitor
>>(640 x 200) and "TTL monochrome monitor (720 x 350)."
>
>>My assumption is that RGB means CGA.  Is this correct?
>
>CGA was certainly 640x200 or 320x200 (depending on how many colors in the
>palette you wanted [4 or 8 I seem to recall]). CGA is actually RGBI rather
>than straight RGB as TTL RGB would only give you 8 colors but adding the
>Intensity bit increases it to 16 (if you include dark white and light black
>as two different greys). CGA also supported composite output to a TV aux in
>socket.
>
>720x350 TTL monochome was the MDA and HGC resolution.
>-- 
>David Wilson  School of IT & CS, Uni of Wollongong, Australia


...and the EGA, which superseded the CGA, was RRGGBB with TWO wires for
each primary color R,G,B, providing a total of 4 intensity levels for
each primary color yielding a total of 4*4*4=64 possible colors.  Yes,
the color signals on both the CGA and the EGA was digital, with a "0"
or a "1" on each wire.

Not until the VGA was genuine RGB introduced in the PC world: the VGA
had one wire for each primary R,G,B but the signal on these wires
were analog signals which could provide many different intensities
for each primary, and as a result millions of possible "colors" on
the screen.

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