EGA Bitmaps on Xenix

[John F. Haugh II]

I wrote a TPLOT -> Hercules converter some time ago, and now that I have
entered the 1980's and purchased a used EGA board and display [ Yes, I am
somewhat behind the times ... ], I am interested in writing a TPLOT ->
EGA converter.

What I would like very much is a collection of algorithms for converting
a random (x, y) coordinate in (r, g, b) color into an actual point on the
screen.  The goal is to use this code as the lowest level routine ala
point() from the tplot library.  I am graphics adapter illiterate, but a
good explanation of the mapping and general scheme of the EGA adapter in
some reasonable mode should suffice.  The results of this project will be
posted to some newsgroup.  Possibly along with the latest incarnation of
the Hercules TPLOT filter, which works nicely with GNUPLOT when I use
both monitors ;-)

In the meantime, if anyone can point me at a GIF viewer for SCO 2.2.3,
I'd be happy.  I've discovered the joy of 30 hour ray tracings and I'd
like to see what they look like, in color rather than the lousey mono
hack job I've been playing with [ Yuck! ].
-- 
John F. Haugh II                             UUCP: ...!cs.utexas.edu!rpp386!jfh
Ma Bell: (512) 832-8832                           Domain: jfh at rpp386.cactus.org