From Libcpu

Contents 1 Generic 2 Archs 2.1 6502 2.2 Z80000

Generic

Bit Twiddling Hacks

Archs

6502

Here is the spec of the never-implemented 65832, in case we want to add it: W65C832.pdf(online)

Z80000

Just to add to the wishlist, the Z80000, documentation can be found here (PDF)(online)