[GEM Development] Update to SETTINGS.APP

[John Elliott]

  And here's the other little project I've been working on: a driver for
the Hercules InColor card, because that's the only way you'll get a 
colour display higher than 640x200 resolution out of the Amstrad PC1512.

<http://www.seasip.info/AmstradXT/pc1512hic.html>

  If you're running GEM on a PC1512, the InColor card is a definite 
improvement over the motherboard chipset. 720x348 graphics rather than
640x200, and the card lets you do logic operations over all four planes 
at once so boxes, lines and text get drawn four times more quickly.

  While writing the driver I found and fixed a bug in the standard 
EGA/VGA driver, dealing with drawing dashed lines in REPLACE mode. I also 
created two new drivers for 8-colour and 4-colour VGA; these were mainly
for my benefit, to test software at different colour depths. The new and
corrected drivers can be found at 
<http://www.seasip.info/Gem/drivers3.html>.

-- 
John Elliott