After 48 years, Zilog is killing the classic standalone Z80 microprocessor chip

Last week, chip manufacturer Zilog announced that after 48 years on the market, its line of standalone DIP (dual inline package) Z80 CPUs is coming to an end, ceasing sales on June 14, 2024. The 8-bit Z80 architecture debuted in 1976 and powered a small-business-PC revolution in conjunction with CP/M, also serving as the heart of the Nintendo Game Boy, Sinclair ZX Spectrum, the Radio Shack TRS-80, the Pac-Man arcade game, and the TI-83 graphing calculator in various forms.

In a letter to customers dated April 15, 2024, Zilog wrote, "Please be advised that our Wafer Foundry Manufacturer will be discontinuing support for the Z80 product and other product lines. Refer to the attached list of the Z84C00 Z80 products affected."

Designers typically use the Z84C00 chips because of familiarity with the Z80 architecture or to allow legacy system upgrades without needing significant system redesigns. And while many other embedded chip architectures have superseded these Z80 chips in speed, processing power, and capability, they remained go-to solutions for decades in products that didn't need any extra horsepower.

Zilog will continue to manufacture the eZ80 microcontroller family, which was introduced in 2001 as a faster version of the Z80 series and comes in different physical package configurations (pin layouts).

Powering a microcomputer revolution

The 8-bit Z80 microprocessor was designed in 1974 by Federico Faggin as a binary-compatible, improved version of the Intel 8080 with a higher clock speed, a built-in DRAM refresh controller, and an extended instruction set. It was extensively used in desktop computers of the late 1970s and early 1980s, arcade video game machines, and embedded systems, and it became a cornerstone of several gaming consoles, like the Sega Master System.

The Tandy Radio Shack TRS-80 (1977), which used the Zilog Z80.

Credit: SSPL/Getty Images

The Tandy Radio Shack TRS-80 (1977), which used the Zilog Z80. Credit: SSPL/Getty Images

During the mid-late 1970s, the Z80 became a popular CPU for S-100 bus machines, which were early personal computers with a 100-pin modular bus system that allowed swapping cards to build systems based on parts from various manufacturers. Digital Research targeted the Z80 as a key platform for its CP/M operating system, and the association between Z80 and CP/M stuck, powering dozens of small business computers until the mid-1980s, when IBM PC clones running Microsoft's MS-DOS became the new industry standard.