Computer Collection Library

IBM 709

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.


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