Basic Concepts

  • Andrew M. Veronis


The first two microprocessors — the 4004 (a four-bit set of devices) and the 8008 (an eight-bit device on a single chip) — were produced in the early 1970s by a newly formed company, Intel Corporation. The 4004, also known as the MCS-4, was designed to replace six custom chips in a desktop calculator and was therefore programmed for serial, binary-coded, decimal arithmetic (a very common practice in handheld and desktop calculators). Although the client, a Japanese manufacturer named Busicomp, went out of business before it could put the 4004 to work, this set of devices was soon adapted for numerous other applications.


Ordinal Number Program Counter Peripheral Device Address Range ASCII Code 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Van Nostrand Reinhold Company Inc. 1988

Authors and Affiliations

  • Andrew M. Veronis
    • 1
  1. 1.Department of Electrical EngineeringHoward UniversityUSA

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