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COLOR.DOC
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1988-02-21
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You may alter, and optionally save, GL's default screen color settings.
Note also, there is a SNOW ELIMINATOR routine (see Caution below!).
Press the F7 key from the main menu. A popout window appears. Press the
spacebar a couple of times, and you will see a question mark surrounded by
arrow symbols -- up, down, left, right. Try all combinations, using the
numeric keypad arrows.
The effect of your changes is immediate (within the box), and immediate and
permanent (for this session) when you exit by pressing Esc.
You may press the F10 key whenever this small window is active, to see what
your options are. The F1, F2, F9, F10 and Esc keys are all color command keys.
They select color foreground/background, blink and intensity.
You press the Esc key (as usual) when you are done. You will be asked if
you want to save the screen colors. GL stores default screen colors in the
user information file, if you tell it to.
Monochrome vs. CGA
------------------
The popout shows a less complete, but appropriate, range of selections
if you are using a MONOCHROME adapter instead of a CGA or EGA adapter. Color
users can choose a totally blank screen: Not all combinations are equally
felicitous. These are matters of personal taste.
Snow Elimination
----------------
If you have an IBM Color Graphics Adapter, you may experience "snow" on your
screens. You will have the opportunity to turn on a "snow elimination"
switch just before the question about saving your color choices comes up.
** Caution **
-------------
IF YOU DO NOT HAVE SNOW, DO NOT TURN ON SNOW ELIMINATION. Unless your
hardware is absolutely compatible with the IBM CGA card, bugs and all, you may
hang your system by turning on the snow eliminator.
Technical detail: Snow elimination works by READING port 03DA until the
raster scan bit indicates screen RAM update is ok. The port is NEVER written
to.
By default, GL's snow elimination toggle is OFF. There is no effect if you
have a monochrome adapter, and the question is not asked.