On 24/07/2018 23:43, Mia Magnusson wrote: > Sound would be hard anyways. In theory you could remap the PET sound > I/O pin to the volume control register of the SID if it happens to use > the right bits. I was mostly thinking about allowing the CB2 pet sound to be remapped from the VIA to the CIA and let the user come up with a way of getting that to produce sound. You could then either run a speaker from it how you did on a pet, or direct it to the sid audio input. > But who did use joysticks on a PET? I've never heard of that. Adding joysticks and sound was a relatively common upgrade, there were a few different schematics. The standard one has 2 joystick ports. https://www.c64-wiki.com/wiki/PET_2001#Joysticks http://www.classiccmp.org/cini/pdf/kilobaud/Pet%20User%20Port%20Cookbook%20(0379).pdf Vice supports them. > Well, as there is only one setting of the 6545/6845 that right for a > given monitor it might be best to not expose those registers to old PET > programs. Sure, blocking that would seem a good idea. > Basic won't use pokes to 0/1 unless it also contains machine code > programs. Yes, but some machine code might still work. You should either block it by denying the poke to 0/1, or try to come up with an alternative that remaps it. Letting the program just die would seem annoying to a user. > A VIC-20 emulator for C64 would imho be rather useless as you can't > emulate anything near how the display hardware works. If it were > possible to set VIC-II to a variable amount of chars per line it could > work better though. Running pet programs on a cbm2 is rather useless too, a pc running vice will do the job better. Isn't it just about the challenge of doing it? I don't recall ever seeing the vic20 emulator run, but I remember it mentioned at school as being printed in a magazine & I assume it just uses 22 columns of the screen http://sleepingelephant.com/ipw-web/bulletin/bb/viewtopic.php?t=468Received on 2018-07-25 12:03:35
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