The Zilog Z80 celebrates its 50th anniversary: a chronicle of the chip that populated our teenage bedrooms

Fifty years after its introduction in 1976, the Zilog Z80 remains one of the most produced chips in history. We look back at its DNA, its machines, its legacy.

A workshop memory

We remember the first time we heard the name "Z80" - page 22 of an Amstrad CPC 464 programming manual, pushed by a cousin who knew we had just opened the box at Christmas. At the time, we didn't know that the same chip was already beating inside a nearby Sinclair ZX Spectrum, an MSX at a more Tokyoite friend's house, and - a few years later - in our transparent green Game Boy.

The origin (1976)

The Zilog Z80 was designed by Federico Faggin, ex-Intel - designer of the 4004 (the very first commercial microprocessor, 1971) and the 8080 (1974). Faggin founded Zilog in 1974 with Ralph Ungermann and Masatoshi Shima (嶋 正利, Japanese engineer who had already worked on the 4004 at Intel). The chip was commercially released in July 1976.

Software compatible with the 8080 but better equipped - alternative registers (AF', BC', DE', HL'), additional instructions for block manipulation (LDIR, LDDR), a single 5V power supply (compared to three for the 8080) - it quickly swept away its big brother Intel in consumer micros.

The machines that carried it

• Sinclair ZX80 (1980), ZX81 (1981), Spectrum (1982) - United Kingdom, the era of mass microcomputing. Clive Sinclair brought a million British households into computing.
• Amstrad CPC (1984) - France found its entry into home computing. Alan Sugar and his color screen included in the box.
• MSX (1983) - a Japanese standard pushed by ASCII (Kazuhiko Nishi, 西 和彦) and Microsoft Japan, with Konami at the ready for games. Heart of the Japanese geek home of the 1980s.
• TRS-80, Osborne 1, Commodore 128 in the United States.
• Game Boy (1989) and Game Boy Color (1998) - not a pure Z80 but a Sharp SM83 that takes most of its instruction set. Silent heart of the Nintendo portable for two decades.
• Sega Master System and Sega Game Gear - not forgetting its use as an audio co-processor in the Mega Drive (Sega Genesis in the United States).
• Japanese pachinko, arcade cards, TI calculators (up to the TI-84 Plus) - the long industrial tail, discreet but colossal.

What the Z80 taught us

The Z80 remained simple enough for a 14-year-old teenager, with a manual, a locked room, and six months of patience, to program a small game in assembly that runs. This pedagogy of direct access to hardware - write an instruction, see a pixel appear - trained a whole generation of European and Japanese developers.

On the Japanese side, two figures come to mind. Yūji Naka (中 裕司) writes his first lines of code on Sega machines based on Z80 - it's on the Master System (Sega Mark III), and on its successors, that he hones his skills before Sonic. Kenji Eno (飯野 賢治), future creator of D and Enemy Zero, learns programming on MSX as a teenager. Two trajectories that remind us that the Japanese MSX/Sega scene was as formative as the British Spectrum/Amstrad scene.

What remains in 2026

Zilog announced the end of production of the traditional DIP Z80 at the end of 2024 - a symbolic shock in the retro community. But silicon has not said its last word: Taiwanese compatible (Xilinx), open source VHDL cores (Daniel Wallner's T80, or T80s), FPGA implementations (MiSTer project) continue to run Z80 code for eternity.

CP/M - the old operating system that ran on Z80 in the 1970s-80s - was made free in 2022 by the Kildall Family Trust. Today, you can download CP/M for free and run it on an emulator in five minutes.

Our amateur note

If you have never written a single line of Z80 assembly, try the exercise on a Spectrum emulator. An LD A,255 followed by OUT (254),A that makes the screen border blink is still one of the most beautiful "hello world" in computer history.

Fifty years. No consumer chip has ever lasted so long in such a wide variety of roles. Happy birthday, old friend.