Zilog Z-80

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The Zilog Z-80  (P/N 156-0983-03,156-0983-04) is an 8-bit microprocessor monolithic integrated circuit introduced in 1975.

It implements an upward-compatible extension of the Intel 8080 instruction set, and requires only a +5 V supply. It adds several registers, a vectored interrupt system, and a hardware DRAM refresh counter to the 8080 architecture.

There were several speed grades, initially starting at 2.5 MHz (non-suffix) / 4 MHz (Z80A) / 6 MHz (Z80B), etc., later CMOS versions up to 20 MHz, and derivatives up to about 50 MHz. Several second-source manufacturers produced their versions of this CPU.

The National Semiconductor NSC800 is code-compatible with the Z-80 but has a multiplexed address/data bus like the Intel 8085, without being pin compatible with either.


Pinout (click to enlarge)

Used in

Some instruments using part Zilog Z-80

Instrument Manufacturer Class Model Description Introduced
318 Tektronix Logic Analyzer 318 16 channel logic analyzer 1984
338 Sony/Tektronix Logic Analyzer 338 32 channel logic analyzer 1984
5223 Tektronix Oscilloscope 5223 10 MHz analog/digital mainframe 1981
834 Tektronix Logic Analyzer 834 Programmable data communications tester 1980
DAS9100 Tektronix Logic Analyzer DAS9100 Logic Analyzer 1982
SPG-271 Tektronix Audio/Video SPG-271 PAL Video Sync Generator 1989
TSG-170 Tektronix Audio/Video TSG-170 digital composite generator 1989
  • 5223 Opt.10 (GPIB board)

Supported by


See also Microprocessor support table.