Intel 8080
From Computer History Wiki
The Intel 8080 was the CPU that was popularized by CP/M machines with the S-100 bus. This was the first 'open' home computer standard before the introduction of the IBM PC 5150.
The 8080 design was licensed out to various other companies for fabrication, and the design was even stolen to be manufactured in Poland, East Germany & Russia.
The Zilog Z80 CPU was based on the 8080, and provides a superset of the 8080 ISA.
