If you ever get the chance to purchase 30 rusty old SID chips from an engineer who worked at Commodore ....
DONT DO IT! Put your energy into something else.
This a small collection of tools, references files, and errata making those old chips sing.
What it is:
siduino - Kicad project / Gerbers A one off PCB design thats an arduino (atmega328p) that has a SID chip on it technically you could program it with the arduino tools if you mapped the pins out properly, but I havent tried it has a 12V and 5V power bus to satisfy the analog-y power needs of the old chips. They run hot.
siduino firmwware - AVR firmware to issue commands to the SID chip from an AtMega328. There is some experimental assembly language driver and some experimental midi in/out.
sidcom - unfinished. A aerial protocol to talk to the SID chip from a modern machine. The board is flawed, the TX/RX pins on the AVR share the lower two bits of the SID chip data bus, so a new board is needed before this can be used. A prototype board is under development.
python tools - Havent done anything yet. The RX/TX flaw really makes this board suck. I need to build a better one with a bigger chip and two SIDs for stereo. maybe someday.
If you are crazy enough to want to build one yourself (beware this revision has the TX/RX flaw):