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| From: Gáti Gergely
Date: 2000-01-18
Subject: Re: SID with Plus4
|
Hello,
> I need some info about the SID card for the Plus4. Whers are the
> registers in the memory? Are there more SID card types?
There's an (or only) SID card for Plus/4 is the memory location
$FF40, if I know well. But there's a hack with this area!
Try to implement the pseudo SID card into memory $D400
(like on a real C64)! There're not so much stuffs what support the real SID card, but many games (and others) use some C64 music conversion routine (if I'm right?), and in many programs there're the original C64 music replay routine,
and it's writing into $D400, so if you turn off the TED sound during this, you'll hear the real SID music!
I don't know the real reason of it, I implement it accidentally in cp4. But it works for me.
_Question_ again:
I need some information about the up/down scroll, especially in raster interrupt. And some info about writing to $FF1E-F,
$FF1A-D!
bye,
--
gega
[ Gáti Gergely - Debrecen ]
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