thumb|280px|ibm 7090 console the ibm 7090 was a second-generation transistorized version of the earlier ibm 709 vacuum tube mainframe computers and was designed for "large-scale scientific and technological applications". the 7090 was the third member of the ibm 700/7000 series scientific computers. the first 7090 installation was in november 1959. in 1960, a typical system sold for $2.9 million (equal to $ million in ) or could be rented for $63,500 a month (equal to $,000 in ). the 7090 used a 36-bit word length, with an address-space of 32k (32,768) words. it operated with a basic memory cycle of 2.18 Î¼s, using the ibm 7302 core storage core memory technology from the ibm 7030 (stretch) project. with a processing speed of around 100 kflop/s,performance of future high-end computers by david bailey lawrence berkeley national laboratory report the 7090 was six times faster than the 709, and could be rented for half the price. ==development and naming== although the 709 was a superior machine to its predecessor, the 704, it was being built and sold at the time that transistor circuitry was supplanting vacuum tube circuits. hence, ibm redeployed its 709 engineering group to the design of a transistorized successor. that project became called the 709-t (for transistorized), which because of the sound when spoken, quickly shifted to the nomenclature 7090 (i.e., seven - oh - ninety). similarly, the related machines such as the 7070 and other 7000 series equipment were called by names of digit - digit - decade (e.g., seven - oh - seventy). ===ibm 7094=== thumb|ibm 7094 operator's console showing additional index register displays in a distinctive extra box on top. note "multiple tag mode" light in the top center. an upgraded version, the ibm 7094, was first installed in september 1962. it had seven index registers, instead of three on the earlier machines. the 7094 console had a distinctive box on top that displayed lights for the four new index registers. photos the 7094 introduced double-precision floating point and additional instructions, but was largely backward compatible with the 7090. minor changes in instruction formats, particularly the way the additional index registers were addressed, sometimes caused problems. on the earlier models, when more than one bit was set 
1959_introductions IBM_700/7000_series IBM_transistorized_computers