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Re: Switch Color To Monochrome Switch?
- Subject: Re: Switch Color To Monochrome Switch?
- From: bieling@terra.es (Jorge Chamorro Bieling)
- Date: Wed, 17 May 2006 16:21:26 +0200
- Newsgroups: comp.sys.apple2
- Organization: Telefonica Data Espagna
- References: <jQDag.7855$fb2.6086@newssvr27.news.prodigy.net>
- User-agent: MacSOUP/2.7 (unregistered)
- Xref: g2news2.google.com comp.sys.apple2:7783
Bryan Parkoff <none@nospam.net> wrote:
> The Apple IIgs' Control Panel has the feature to switch from Color to
> Monochrome for DHGR. Do it have in $C0XX as softswitches? I can't find in
> the manual. Do you know? I do not have to go through Control Panel.
>
> Bryan Parkoff
There's the 8th bit (MSB,$80,bit 7) of $c021. Setting it to 1 to removes
the color burst from the composite video signal (B&W). The other bits
are reserved, so better read $c021 first, OR with $80, and write the
result back to $c021.
And the 6th bit ($20,bit 5) of $c029. Setting it to 1 displays DHGR in
B&W. The other bits are reserved, so better read $c029 first, OR with
$20, and write the result back to $c029.
--
Jorge Chamorro Bieling