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an 8-bit microprocessor designed by Zilog founder and CEO Federico Faggin, first released by Zilog in July 1976. It was designed to be binary upward compatible with the Intel 8080 so that most notably the CP/M operating system would run unmodified, but offered an enhanced instruction set, two separate register banks plus two additional 16-bit index registers IX and IY.
Die photo of a Z80A clone [1]


The 8080 compatible registers AF, BC, DE, HL are duplicated as two separate banks in the Z80 [2]


Like 8080, Z80 is a little-endian machine, concerning the byte-order of 16-bit words in memory.

Z80 Chess Programs

with Assembly listings:

See also

Selected Publications

External Links


  1. ^ die photo of a clone of the Zilog Z80A 8-bit microprocessor. Die size 4950x4720µm. Technology node 5µm, source: Part II: How to «open» microchip and what's inside? Z80, Multiclet, MSP430, PIC and more : ZeptoBars, Zilog Z80 from Wikipedia
  2. ^ Z80 architecture, by Appaloosa, October 17, 2007, Zilog Z80 from Wikipedia
  3. ^ pdf download link by Rodnay Zaks

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