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IBM System/360, Model 91 (console)

Manufacturer International Business Machines
Identification,ID System/360, Model 91 (console)
Date of first manufacture-
Number produced -
Estimated price or cost-
location in museum -
donor -

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IBM System/360, Model 91 (console)


IBM S/360 Model 91, 1970

The high end of IBM's popular System 360 family. It had 4 MB of fast memory, a CPU speed of about 3 MIPS, and could support hundreds of peripherals. It ran FORTRAN, PL/1, Algol, COBOL, LISP, and many other languages and applications. This console allowed the operator to check the status of the entire system and to intervene if required. The machine used Solid Logic Technology (SLT), an IBM invention which encapsulated 5-6 transistors into a small module--a transition technology between discrete transistors and the IC: This machine was used at the Stanford Linear Accelerator Center.

IBM-360-91 - by Ron Mak

The IBM System/360 Model 91

IBM designed the System/360 Model 91 to handle high-speed data processing for scientific applications and to compete against Control Data's 6600 and 6800 supercomputers.

The Model 91 set many precedents for the design of high-speed computers. To achieve its performance, it used high-density circuit packaging and executed operations concurrently. The CPU consisted of five autonomous units: instruction, floating-point, fixed-point, and two storage controllers for the overlapping memory units and the I/O data channels. The floating-point unit made heavy use of instruction pipelining.

The first shipped 360/91 began operating in January 1968 at the Goddard Space Flight Center of NASA.

Manufacturer: IBM Memory technology: magnetic core
First introduced: 1966 Memory size: up to 6M bytes
CPU technology: transistor Machine cycle time: 60 nanoseconds (16.7 MHz)

Sources: Emerson W. Pugh, et al. IBM's 360 and Early 370 Systems. Cambridge, MA: MIT Press, 1991. pp. 380-395
Paul E. Ceruzzi. A History of Modern Computing. Cambridge, MA: MIT Press, 1998. pp. 143-175


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Updated July 15, 2001