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Re: Apple IIgs' Super Res Locked Up?
- Subject: Re: Apple IIgs' Super Res Locked Up?
- From: Rob Greene <nospam-greener@charter.net>
- Date: Sat, 27 Aug 2005 03:24:20 GMT
- Newsgroups: comp.sys.apple2
- References: <IwJPe.34$m56.20@newssvr24.news.prodigy.net> <Xns96BEAC21F8340greenercharternet@69.28.186.121> <9GQPe.5510$L77.925@newssvr19.news.prodigy.com>
- User-agent: Xnews/5.04.25
- Xref: g2news1.google.com comp.sys.apple2:5148
"Bryan Parkoff" <nospam@nospam.com> wrote in
news:9GQPe.5510$L77.925@newssvr19.news.prodigy.com:
> LDA $C029
> ORA $#C0
> STA $C029
> RTS
>
> This routine above works because first instruction is READ, second
> instruction is MODIFY, and third instruction is WRITE. You can use
> "AND $#3F" to turn off Super Resolution.
> Does it make sense?
Exactly! I remember when I was first playing with SHR, I would (from the
monitor) type in the address, make note of the value, do the ORA in my
head, and then set the value from the monitor.
-Rob