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  • Re: Making the ][+ better

    From Rubywand@rubywand@swbell.net to comp.sys.apple2 on Monday, October 04, 2004 17:25:14
    From Newsgroup: comp.sys.apple2

    "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.


    Rubywand
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  • From mjmahon@mjmahon@aol.com (Michael J. Mahon) to comp.sys.apple2 on Monday, October 04, 2004 17:38:12
    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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