From Newsgroup: comp.sys.apple2
Rubywand replied:
"Michael J. Mahon" writes ...
Rubywand writes ...
If you'd like to try building the circuit to kill color in the Text
beneath
graphics displays, there's a diagram pic at ...
http://apple2.org.za/gswv/a2zine/Docs/DiagramsAndSchematics/TextColorKill >> er.jpg
This is a fine example of a "fast" color killer, which works not by
putting the monitor into monochrome mode (which would take some
time) but by reducing the gain of the chroma subcarrier.
The visual result is the same, except for "clever" color monitors
like the AppleColor Composite, which will not have time to increase
its lumnance bandwidth for sharp text, as it does when it switches
to monochrome mode.
I think that there is another place in the AppleColor Composite
circuit where a similar circuit could be attached to switch it to
true monochrome mode quickly, allowing crisp 80-column text
under a DHR display.
....
If there's a Color-Monochrome switch, you thing that might be a good
place
to attach the color killer circuit?-- i.e. to switch to Monochrome.
It would certainly be a good place to try. It may still be a "slow"
switch, but perhaps not.
I haven't seen a schematic of the AppleColor Composite, but that
would reveal any good places for fast monochrome switching.
-michael
Check out parallel computing for 8-bit Apples on my
Home page:
http://members.aol.com/MJMahon/
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