NuBus (Texas Instruments and Apple)

• Parallel system bus (within a computer)

  • used in TI and Apple computers
  • 40MBytes/sec maximum transfer rate
  • fully synchronous (data transfer and arbitration)

• Supports up to 16 masters

  • distributed arbitration
  • fairness enforced

• All operations are memory-mapped

  • read/write is everything

• Mechanical standards

  • size and shape of boards
  • position of pins
  • capacitance limits

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