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Varies from machine to machine:

  • many early machines had address busses only 12 to 18 bits wide
  • early microprocessors has address busses 10 to 14 bits wide
  • 16 bit address busses were common on microprocessors in the early 1980s
  • the 8086 had a 20 bit address bus and the 68000 a 24 bit address bus
  • most modern computers have 32 bit address busses with high-end ones having as many as 64 bit address busses
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