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| From: indi (all posts)
Date: 2000-01-19
Subject: Re: SID with Plus4
|
On Tue, 18 Jan 2000 10:55:30 +0100, you wrote:
>> 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.
>Clue, laziness... :))))
Many demos I'd guess ran the actual C64 code, then copied the registers into the plus/4 location, rather than relocating the C64
code.... Oh yeah... thats laziness isn't it.. just what you said ;-)
>> I need some information about the up/down scroll, especially in
>> raster interrupt. And some info about writing to $FF1E-F,
>> $FF1A-D!
>Clue, grab the letters from the archive first, and read it through,
>there were a lot of talk about these regs and some more....
>Sending a 'help' command to majordomo@c64.rulez.org is a starting
>point to get to the archive letters, but Lion will correct me,
>if it's not....
I still have them all here as well..... somewhere :-)
Mike
^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^
Mike Dailly mike@scotch.demon.co.uk http://www.scotch.demon.co.uk
(Please remove the <REMOVE_ME> from my e-mail address when replying)
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