Definition
The Model 91 was the highest performing computer system introduced by IBM as part of its System/360 series in the 1960s. It was distinguished by a number of innovations such as out-of-order instruction execution, Tomasulo’s algorithm for data flow execution, a limited form of branch speculation, pipelined execution units, and division by binomial series approximation.
Discussion
Introduction
When IBM introduced System/360 in 1964, it included an announcement of a high-end computer referred to as “Model 90.” This computer was realized as the Model 91 with first installation in 1967. While the Model 91 had a core memory with 750 ns cycle time, there was a fast memory version which used thin-film magnetic storage with a cycle time of 250 ns. This version was labeled the Model 95; two Model 95s were produced. Orders for the Model 91 were closed in 1968, but a revised version with improved technology and cache was introduced around 1970 as the Model 195. The Model 195 used the...
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Bibliography
The following eight papers are all from the special issue of the IBM Journal of Research and Development devoted to The IBM System/360 Model 9; vol 11, issue 1, January 1967
Flynn MJ, Low PR Some remarks on system development, pp 2–7
Anderson DW, Sparacio FJ, Tomasulo RM Machine philosophy and instruction handling, pp 8–24
Tomasulo RM An efficient algorithm for exploiting multiple arithmetic units, pp 25–33
Anderson SF, Goldschmidt RE, Earle JG, Powers DM, Floating-point execution unit, pp 34–53
Boland LJ, Messina BU, Granito GD, Smith JW, Marcotte AU Storage system, pp 54–68
Langdon JL, Van Derveer EJ Design of a high-speed transistor for the ASLT current switch, pp 69–73
Sechler RF, Strube AR, Turnbull JR ASLT circuit design, pp 74–85
Lloyd RF ASLT: an extension of hybrid miniaturization techniques, pp 86–92
Other papers mentioning the Model 91 or related computers
Flynn MJ (1966) Very high speed computers. Proc IEEE 54: 1901–1909
Flynn MJ (1998) Computer engineering 30 years after the IBM model 91. IEEE Comput 31(4):27–31
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Flynn, M. (2011). IBM System/360 Model 91. In: Padua, D. (eds) Encyclopedia of Parallel Computing. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-09766-4_265
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DOI: https://doi.org/10.1007/978-0-387-09766-4_265
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