IBM 709


IBM 709

(computer)A computer made by IBM oriented towardscientific work. The 709 had the same basic architecture asthe IBM 704 but with many I/O and performance refinementsover the 704.

The IBM 709 (like the 704) had 36-bit memory words, 15-bitaddresses and instructions with one address. A few index register instructions had the infamous 15-bit decrement fieldin addition to the 15-bit address.

The IBM 7090 was a transistorised version of the 709.