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μCOM-4 is a microcontroller (microprocessor) family introduced by NEC in 1973. It had a 4-bit architecture. The microcontroller ran at 1 MHz clock speed and had 4Kb of address space. It was manufactured as Sharp requested them for their products. The first chip in the family was the μPD751, a single-chip microprocessor.


NEC released the μPD707 and μPD708, a two-chip 4-bit CPU, in 1971.[1] They were followed by NEC's first single-chip microprocessor, the μPD700, in April 1972.[2][3] It was a prototype for the μPD751, released in April 1973,[2] combining the μPD707 and μPD708 into a single microprocessor.[1]


  1. 1.0 1.1 NEC 751 (uCOM-4). The Antique Chip Collector's Page. Archived from the original on 2011-05-25. Retrieved on 2010-06-11.
  2. 2.0 2.1 1970年代 マイコンの開発と発展 ~集積回路, Semiconductor History Museum of Japan
  3. Jeffrey A. Hart & Sangbae Kim (2001), The Defense of Intellectual Property Rights in the Global Information Order, International Studies Association, Chicago