The PPS-4/1 (Parallel Processing System - 4-bit word - 1 chip) was a family of 4-bit microcontrollers chips designed by Rockwell International and introduce in 1st quarter of 1976. The PPS-4/1 is the third iteration of the original PPS-4. The PPS-4/1 were architecturally identical to the PPS-4 and PPS-4/2 with the addition of a clock generator incorporated internally, making it a single-chip system (hence the "/1").
The PPS-4/1 were considerably slower than their multi-chip counterparts, operating at only up to half of their frequency (40 KHz-100 KHz).
|MM75||48x4 bits||640x8 bits||22||Reduced I/O|
|MM76||48x4 bits||640x8 bits||31|
|MM76C||48x4 bits||640x8 bits||39|
|MM76D||48x4 bits||640x8 bits||37|
|MM76E||48x4 bits||1024x8 bits||31|
|MM77||96x4 bits||1344x8 bits||31|
|MM78||128x4 bits||2048x8 bits||31|
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