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Fun fact: The Macintosh II (68020) had two 6502 processors on its motherboard, somewhere in the I/O system. Originally intended to do some kind of I/O accelerat

by kabdib 3y ago

Fun fact: The Macintosh II (68020) had two 6502 processors on its motherboard, somewhere in the I/O system. Originally intended to do some kind of I/O acceleration, they were never used by MacOS. I heard they just ran Mandlebrot-generation test code.

rjsw 3y ago
The IIfx, Quadra 900 & Quadra 950 each have two 6502 processors. They offload ADB processing (keyboard and mouse), the floppy disk and serial ports. MacOS uses all of them, NetBSD can use ADB offload.
- kabdib 3y ago
  Oh, cool! I thought that only A/UX had made use of them.