🚀 go-pugleaf

In article <1992Aug20.211721.13487@kakwa.ucs.ualberta.ca>, nadine@solstice.ucs.ualberta.ca (Nadine Leenders) writes:
|> Is there any low-cost software available for a '386 PC with VGA
|> that will take two grey-scale images, display one in red, the
|> other in green, except in areas of overlap where the resulting
|> colour is to be yellow?

I don't quite understand your problem.
Just displaying in VGA mode can be done by doing BIOS interrupts,
for example one to change the lookup table and one to display a
pixel. Displaying pixel by pixel is very slow but easy, because
you need only a very small assembly routine to which the data is
passed (from fortran eg) and which puts the data in specific registers
before doing the interrupt.
This is standard and well documented (BIOS calls, registers, codes).

When you are not familiar with this you might look for a local guru.
SuperVGA programming is not very difficult but requires some insight
into lookup table storage and writing an entire image directly in
SVGA memory, plus exact knowledge of SVGA registers.
I developed my own assembly routines which I link with MS fortran
programs. I can display an image in a fraction of a second, fill or
scroll lookup tables in vertical retrace time, etc.
But I am using a ET3000 SVGA, only 256x256 images, and did not develop
a generally applicable software package that can be used on any system.
It's just a hobby package with too much tricks (and traps)...

Look for this book:
G. Sutty and S. Blair
Advanced programmer's guide to SuperVGAs
Brady, New York, 1990

Comes with a floppy with lots of examples for different SVGA boards
and with standard C interfacing. I changed it to fortran interface
and used some other instructions, for example the 'rep outsb' from
the 186 set.

Hope this helps
Hans