Post by Pinacolada on Dec 13, 2008 18:36:17 GMT -5
I don't know whether this is a totally ridiculous idea, but a C64 can power up and function perfectly fine without a SID chip present. What if one replaced it with a different chip, replacing it into a miniature RAMdisk?
It's a plug-in replacement for the SID based on an AVR microcontroller. So it seems you can plug other chips into the SID socket (with suitable pin reassignments) without adverse affects to the C64's operation.
So I would guess that you could put a small RAM chip there with a little board to remap the pins.
I recall that you can't PEEK the values within the SID though - does anyone know if that's because of the SID's design, or does the PLA prevent it?
What you're proposing is almost like using the SID socket as an "option ROM" socket for the C64 (albeit with much more limited addressing space).
A fun project would be to use something like the RTC/NVRAM chip I used for my PET a while back.