Rockwell PPS-4/1
Developer	Rockwell International
Manufacturer	Rockwell International
Production	1976
Architecture	4-bit words, 8-bit instruction
Word size	4 bit 0.5 octets 1 nibbles
Technology	pMOS
Clock	40 kHz-100 kHz
Package	QIL42

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 and program memory incorporated internally, making it a single-chip system (hence the "/1"). It's full compatible with all the original PPS-4 CPU and all the other parts.

Members

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).

Part	RAM	ROM	I/O Ports	Notes
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

See also

• PPS-4

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