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Sasq
Registered: Apr 2004
Posts: 156 |
Playing SIDs on the 64
So, anyone has some insights on how to make sid player as compatible as possible?
This is what I'm currently doing, and it works reasonably well:
- Put the player on $100-$180 (seems to be a bit more safe than $400). Of course it's best to use the reloc info in the SID if it exists, but often it doesn't.
- Clear all SID-regs before each subtune, except #$F -> $D418.
- Check the high nibble of the init adress, and set banking accordingly.
Things that doesnt work:
Some obviously broken SIDs, like Mikey who has its Init under ROM but still puts #$37 in $01. Playsid64 handles this though, not sure how you do that without actually checking the code for such things.
RSID. What I first thought was a good thing turns out to be stupid, since many of them put the player in the INIT and there is no way of changing song without resetting (or maybe use NMI to break it ?)
Also the ones that do install an interrupt and return like they're supposed to often break when you try to switch songs.
Thoughts, comments, anything to add?
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Bastet
Registered: Jul 2005
Posts: 88 |
I ahve some other problems with the mmc64-sidplayer.
Some tunes play correctly but if i exit to fileman he crashes.
A reset wont wake him up, i need to switch my C128D off and after 10 seconds on again. Repeat if i cant get into the filemanager from the startmenu. :-/
Other missbehaviour:
fall_guy.sid is way too muted.
antic_war.sid says "digital" and then i get a gray screen.
Sometimes i get just some garbage on the screen and i need to do the 10 second cold start.
Maybee it would be a great idea to detect a C128 and use the extra RAM for moving the player into upper memory? |
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Steppe
Registered: Jan 2002
Posts: 1510 |
The idea is nice, but this is the wrong place to suggest it. Contact Oli Achten directly (email should be in the manual or in the MMC64 programming guide on www.ami.ga).
And don't blame everything on the player, often the rips are responsible for this. Especially RSID files set up their own interrupt handler and take full control of the machine in order to play correctly.
Still, the 10 seconds wait is a strange thing. |
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6R6
Registered: Feb 2002
Posts: 245 |
Here's a little sidplayer i did.
Sids that relocates itself elsewhere than the
actual load adress might crash.
http://home.eunet.no/~ggallefo/tools/SIDPLAY64_beta.zip
Works best with action replay,
Glenn |
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Bamu®
Account closed
Registered: May 2005
Posts: 1332 |
Haa, I wish mmc64 would offer such a nice player. :-)
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