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

Part	Function	Description
10660	CPU	Original "PPS-4" CPU
11660	CPU	"PPS-4/2" CPU
10432	RAM
10686	General purpose I/O
10696	General purpose I/O
10706	clock
10731	com data interface
10738	Bus I/O
10736	dot matrix printer controller
10788	keyboard/display controller
10789	printer controller
10815	keyboard/printer controller
10930	serial data controller
11049	interval timer
15380	dot matrix printer controller
A05xx	ROM
A07xx	ROM
A08xx	ROM
A17xx	ROM	This is the 2nd chip used with the 11660 PPS-4/2 CPU
A21xx	ROM
A22xx	ROM
A23xx	ROM
A52xx	ROM

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).

Part	RAM	ROM	I/O Ports	Notes
MM75	48x4 bits	640x8 bits	22	Reduced I/O
MM76	48x4 bits	1024x8 bits	31
MM77	96x4 bits	1344x8 bits	31
MM78	128x4 bits	2048x8 bits	31

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)