IOU stands for Input/Output Unit. It controls all of the basic I/O on the computer.
MMU stands for Memory Management Unit. It controls how the CPU talks to the onboard memory.
Cracking Open the Apple IIc
by John Sheesley | October 17, 2008, 10:48am PDT | Image 50 of 59
IOU and MMU
Above the CPU and to the right of the Keyboard ROM are the IOU (top) and MMU (bottom).
IOU and MMU - Image 50 of 59
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