IBM 709

The 709 was a 36-bit binary machine very similar to the 704. It added data channels instead of programmed I/O. The data channels were programmable DMA units that operated independently of the CPU. It added some new instructions and architectural features, but also had a compatibility mode to emulate a 704 by blocking off part of the memory and trapping 704 I/O instructions.

Related

• class: The IBM 700 Series
• class: The IBM 709x Series
• class IBM 709:
  • IBM 709, s/n 1
  • IBM 709, s/n 30
• for IBM 709:
  • IBM 709 Diagnostics
  • IBM 709 CPU Diagrams
  • IBM 729 Model I Tape Drive

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