Article · Wikipedia archive · Last revised Jun 21, 2026

MMN80CPU

MMN80CPU is a Z80A microprocessor clone, working at 4 MHz. It was produced from 1988 onwards at Microelectronica Bucharest for the Romanian automation industry and 8 bit computers such as HC-91, HC-2000, Tim-S, CoBra, CIP, JET, CUB-Z, aMIC, PRAE and others. It exhibited a unique and unusual behavior: immediately after a reset, it activated the M1 line without using RD or IORQ to reset a PIO controller directly, saving a gate in industrial systems with PIOs.

Last revised
Jun 21, 2026
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≈ 1 min
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Wikipedia ↗
MMN80CPU
An MMN80CPU processor.
General information
Launched1988
Common manufacturer
Performance
Max. CPU clock rate2.5 MHz to 4 MHz
Physical specifications
Cores
  • 1
Socket
Architecture and classification
Instruction setZ80

MMN80CPU is a Z80A microprocessor clone, working at 4 MHz. It was produced from 1988 onwards at Microelectronica Bucharest1 for the Romanian automation industry and 8 bit computers such as HC-91, HC-2000, Tim-S, CoBra, CIP, JET, CUB-Z, aMIC, PRAE and others. It exhibited a unique and unusual behavior: immediately after a reset, it activated the M1 line without using RD or IORQ to reset a PIO controller directly, saving a gate in industrial systems with PIOs.

  • CIP-03
    CIP-03
  • CoBra
    CoBra


References

References

  1. "microelectronica" (in Romanian). Retrieved 2019-08-15.