Revision as of 01:51, 21 January 2016

Rockwell PPS-4
Rockwell PPS-4 found in the PC-1001 programmable calculator. PPS-4 (part 10660) on the upper-right corner along with the 10706 clock generator, GP I/O 10696, ROM (A05xx), RAM (10432), and a 7400 series 74154 decoder.
Developer	Rockwell International
Manufacturer	Rockwell International
Production	August, 1972-1981
Architecture	4-bit words, 8-bit instruction
Word size	4-bit "-bit" is not declared as a valid unit of measurement for this property.
Technology	pMOS
Clock	40 kHz-256 kHz
Package	QIL42

The PPS-4 (Parallel Processing System - 4-bit word) was a family of 4-bit microprocessor chips designed by Rockwell International and introduce in 3rd quarter of 1972.

The original PPS-4 chipset was designed to provide complete functionality in three chips - CPU, program memory, and a clock generator. A later version known as the PPS-4/2 ("/2" denoting a two-chip system) eliminated the external clock generator chip by incorporating it internally. A third variation known as the PPS-4/1 ("/1" being a single-chip microcomputer) was actually a microcontroller, including the program memory internally.

History

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Members

PPS-4/1 microcontrollers

Rockwell expanded the family by introducing the PPS-4/1 which is a microcontroller incorporating the PPS-4 CPU, the program memory, and clock generator internally. 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).

2nd source

National semiconductor later became a second source for the PPS-4.

Applications

While not as known as the other chips like the MCS-4, the PPS-4 certainly never received as much mainstream exposure. Nevertheless, it did find its way into many industrial and consumer products such as toys, desktop calculators, games, and other electronic appliances.

Design

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Instruction set

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Documents

• Orignal PPS-4 System Manual (1974)