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Computing (FOLDOC) dictionary
IBM 709
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computer A computer made by IBM oriented toward
scientific work. The 709 had the same basic architecture as
the IBM 704 but with many I/O and performance refinements
over the 704.
The IBM 709 (like the 704) had 36-bit memory words, 15-bit
addresses and instructions with one address. A few indexregister instructions had the infamous 15-bit decrement field
in addition to the 15-bit address.