Zilog Z80
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The Z80 was a CPU chip from Zilog that was compatible with the Intel 8080. It was manufactured from 1976. The Z80 is still (2016) in production by Zilog. The instruction set is a superset of the 8080 instruction set, but the Z80 assembler syntax is different from the Intel 8080 assembler syntax.
Faster versions of the basic 2.5 MHz Z80 were given different terminal letters in the name: Z80A (4 MHz), Z80B (6 MHz) and Z80H (8 MHz).
