The
IBM 709 is a discontinued
computer system introduced by
IBM in August 1958. It is an improved version of the
IBM 704 and the second member of the IBM 700/7000 series of scientific computers. The improvements included overlapped input/output,
indirect addressing, and three "convert" instructions which provided support for
decimal arithmetic, leading zero suppression, and several other operations. The 709 had 32,768 words of
36-bit magnetic core memory and could execute 42,000 add or subtract instructions per second. It could multiply two 36-bit integers at a rate of 5000 per second.