Zilog Z-80
The Zilog Z-80 (P/N 156-0983-03,156-0983-04,156-0963-02,156-2280-00) 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, indexed addressing modes, 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 were available with 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.
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Used in
Some instruments using part Zilog Z-80
| Instrument | Manufacturer | Class | Model | Description | Introduced |
|---|---|---|---|---|---|
| 1503B | Tektronix | Reflectometer | 1503B | Time Domain Reflectometer | 1988 |
| 1503C | Tektronix | Reflectometer | 1503C | Time Domain Reflectometer | 1992 |
| 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 |
| 835 | Tektronix | Logic Analyzer | 835 | Programmable data communications tester | 1986 |
| 836 | Tektronix | Logic Analyzer | 836 | Programmable data communications tester | 1986 |
| 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 |
Supported by
NSC800
See also Microprocessor support table.