Information about the IBM 709

IBM 709

The follow up to the IBM704. Utilizing ideas learned from the Strech IBM enhanced the 704 by adding multiple communications channels to speed up processing I/O devices. This allowed the machine to continue processing while the tapes or card readers transfered data. Also this was one of the first machines to feature indirect addressing. Also added as an indicator register to hold flags and other information. The IBM 709 was announced January 2, 1957 withdrawn April 7, 1960. Originally the IBM 709T later to be named the IBM 7090 by customers, the machine was a faster version of the IBM 709 implimented in transisters instead of tubes.


Programming model


The following software has been recovered for the IBM 709. It will also run on a 7090 or 7094.