IBM 709

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IBM 709

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 index register instructions had the infamous 15-bit decrement field in addition to the 15-bit address.

The IBM 7090 was a transistorised version of the 709.

References in periodicals archive ?
Amdahl joined IBM in 1952 where he worked on the IBM 704, the IBM 709, and then the Stretch project, the basis for the IBM 7030.
The IBM 709 computer calculated normal orbital flight information in addition to its most important function -- determining trajectory dynamics during the critical launch and early orbit phase.