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 0.5 octets 1 nibbles
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

This section is empty; you can help add the missing info by editing this page.

Members

Part	Function	Description
10660	CPU	Original "PPS-4" CPU
11660	CPU	"PPS-4/2" CPU
12660	CPU	Same as 10660
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
A21xx	ROM
A22xx	ROM
A23xx	ROM
A52xx	ROM

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

This section is empty; you can help add the missing info by editing this page.

Instruction set

This section is empty; you can help add the missing info by editing this page.

Documents

• Orignal PPS-4 System Manual (1974)