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Rockwell got an early start with microprocessors with the PPS-4. Rockwell later moved to second source the MOS 6502. Rockwell became the preferred supplier for some versions, even creating versions not offered by MOS.

Rockwell PPS-4

General General Information The PPS-4 is one of only four microprocessors introduced before 1974 (the others being Intel’s 4004 and 8008, and National Semi’s IMP-16). The PPS-4 was the only competitor to Intel 4004. And like the 4004 was originally developed for calculator applications. The PPS-4 chip technology was metal gate versus the 4004’s silicon …

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