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Rockwell PPS-4 Developer Rockwell International Introduction date 1972 Model 10660 12660 Clock 256 kHz (PPS/1) 198.864 Khz (PPS/2) Bus Width 4-bit Memory Specs Max Memory 2KB Addressable 4KB I/O Specs General Purpose IO 31 ports[1] Packaging Package 42-pin QUIL[1]

The Rockwell PPS-4 (Also PPS-4/1, PPS-4/2) was a 4-bit microprocessor designed by Rockwell International and first produced at the 3rd quarter of 1972.^[1] The chip came in a 42-pin quadruple in-line package and was fabricated using metal gate technology as opposed to the Intel 4004 which used silicon gate technology. The PPS-4 was one of only four microprocessors introduced before 1974.^[2] In 1975 Rockwell released a second revision of the chip which was marked PPS-4/2.^[3] Various Gottlieb's pinball machines use the PPS-4.^[3] Unlike the Intel 4004, the PPS-4 was produced and sold throughout the 1980s.

System

Similarly to the Intel 4004, the Rockwell PPS-4 required two additional support chips: a clock generator and ROM memory. The chip came in a 42-pin QIP package. 12 I/O terminals are available for general purpose I/O.

Versions

The PPS-4 came in two versions: 10660 and the 12660. The difference between the two is unclear.

Instruction set

The PPS-40 came with a relatively large set of instruction.

References