Fun fact: you can run a dual core 6502 system by hooking up the two processors to the same memory bus, one using an inverted clock. (Slightly more complicated t

Fun fact: you can run a dual core 6502 system by hooking up the two processors to the same memory bus, one using an inverted clock. (Slightly more complicated than that, but only slightly.) The Commodore Pet disk drives used this trick; one processor was the application processor, which listened for IEEE488 commands and handled the disk format; the other processor handled the low-level stuff (we'd call it a DSP today). Yes, the Pet disk drive did have twice the number of processors as the computer it was attached to. http://www.6502.org/users/andre/petindex/drives/arch/index.html http://www.6502.org/users/andre/petindex/drives/arch/index.h...