🚀 go-pugleaf

as my understanding goes, when you read from the VGA, 4 latches are set,
one from each plane, so, the reasoning goes, that if you want to prime
the latches to user the VGA to do your logical operations (AND/OR...)
then you will simply have to read ONCE per write, so it will take 2X
longer to do things, which if you are updating 4 planes at a time is
STILL 2X faster than mode 13h, assuming of course that 13h and ModeX
really do work at the same speed, as there is some debate and I haven't
done any experimenting myself yet.

on another note, does anyone know of a good way to debug programs that
use ModeX without killing the graphics display?  Turbo Debugger fails
miserably at this.  I would be happy with suggestions for other
debugging software that leaves the VGA registers alone.  I am mainly
interested in debugging graphics code on a system with one monitor, as I
can't really afford to go and buy a  new one right now.

dan reznick
reznick@acf3.nyu.edu