The Z80 turns 50: a look back at the chip that changed everything

In 1976, Federico Faggin left Intel to found Zilog and launch the Z80, an 8-bit processor that would power tens of millions of computers, consoles, and devices for the next two decades. Fifty years later, it is still in use.

One evening in 1976, somewhere in California

We remember the first time we opened the hood of an MSX. The Z80 was there, a small square of gray ceramic, stamped with "Zilog Z80A." We didn’t yet know that this chip had been designed in a rush by a handful of engineers who had just walked out of Intel, carrying with them the ambition to do better than the 8080 they had just designed.

Federico Faggin, one of the architects of Intel’s 8080 family—and previously co-designer of the Intel 4004, the very first commercial microprocessor—founded Zilog in 1974 with Ralph Ungermann. Masatoshi Shima, who had been the lead designer of the 8080 at Intel, joined them shortly after to lead the development of the Z80. Two years after its founding, in July 1976, the Z80 was released. The target: to directly compete with Intel’s 8080, with more registers, an expanded instruction set, and a simplified data bus that no longer required external support chips. At $25 apiece, it was also cheaper.

What the Z80 powered

The list is dizzying. We can’t name them all without forgetting something important—so here are the machines that mattered to us:

The personal computers of the golden age:

• The ZX Spectrum (Sinclair, 1982) – the machine that put code into the hands of a generation of Brits, clocked at 3.5 MHz
• The MSX (multi-vendor standard, 1983) – Japan-centric, the foundation of many Konami classics
• The TRS-80 (Tandy/Radio Shack, 1977) – one of the "1977 Trinity" alongside the Apple II and Commodore PET
• The Amstrad CPC (1984) – the machine for those who didn’t choose the Spectrum

Consoles:

• The Game Boy (Nintendo, 1989) – technically a Sharp LR35902, a Z80 derivative stripped of some instructions but sharing the same core. Millions of us learned to code on it without realizing.
• The Sega Master System and Mega Drive both used a Z80 (as an audio co-processor in the Mega Drive)
• The Neo Geo also included it as a secondary audio processor

The forgotten devices: Texas Instruments calculators (TI-83+, TI-84), arcade cabinets, industrial automata, modems. The Z80 outlived its desktop era, surviving in embedded systems long after it vanished from offices.

Fifty years and still going strong

What’s remarkable about the Z80 is its industrial longevity. While its contemporaries disappeared from catalogs in the 1990s, the Z80 kept being produced—in evolved forms like the eZ80 or integrated into microcontrollers—for embedded applications. In 2024, Zilog (now a subsidiary of Onsemi) announced the end-of-life for several references—but not all.

Fifty years. A chip designed before most people even knew what a personal computer was is still running in production systems somewhere in the world. Maybe that’s the real legacy of the Z80: not just the machines it powered, but the technical culture it helped create. Thousands of developers learned assembly on a Z80. Game creators shaped their pixel sense within its constraints. Embedded engineers built industrial systems that have been running for thirty years.

Happy birthday, little gray chip.