Replace rare/expensive/unreliable MOS CPUs
6510 (C64) (8500 is same as 6510)
6510T (1551 floppy drive)
8501 (C16, C116, Plus/4) (7501 is same as 8501)
8502 (C128)
Licensed under Creative Commons BY-SA: (https://creativecommons.org/licenses/by-sa/4.0/)
If you want one, check my store for stock: (https://monotech.fwscart.com)
The above four CPUs have the same dies I believe, with just different internal pads exposed to the DIP-40 pins.
It's a standard 6502 die, with an added 8-bit bidirectional I/O port, tri-state bus buffers, and an AEC latch enable for 8501 mode.
This device uses a standard 6502 CPU, and implements the extra functions using discrete logic - no programmable parts.
Standard 6502 CPUs are abundant and cheap, and produced by many manufacturers (Rockwell, UMC, Synertek, MOS, etc).
You can use a 65C02 or W65C02, but this is untested, and will cause compatibility issues with some software at the least, or not work at the worst.
If using a WDC W65C02, you must cut jumper W.