Some research links for one of those school projects:
- Dan B's 6502 Tech Page says the C64's 6510 is a 6502 with an 8-bit I/O port.
- Dan has "one of the best references" for 65xx obscurities, with a lucky 6510 slant.
- The Commodore 8-bit WWW server looks dauntingly exhaustive. (Thanks, David.)
- A BYTE article on the 1994 death of Commodore, via Commodore 8-bit WWW Server above.
- 6502.org is all about the 6502.
- 6502.org has original datasheets for all the 65xx chips in PDF and (ick) GIF.
- Here is where hardware hacker Kevin Horton doesn't sell SID music playing devices.
- Everything2, of course, has a node about the C64, including lyrics to the Barcelona song of the same name.