IBM 709

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.

The IBM 7090 was a transistorised version of the 709.

[Difference between 704 and 709?]

(1999-01-19)