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"There are two versions of the Model 168: the Model 1 and the Model 3." [5]: preface IBM referred to the System/370 Model 168-3 as "the company's previous flagship" [8] when comparing it and the then-new IBM 3033. The 168-3 CPU's internal performance has been described as 5–13% faster than the 168-1. [5]: p.125
The Model 115 came standard with 65,536 (64 KB) of memory, but it could optionally be ordered with up to 196,608 (192 KB). The system had a CRT operator console . Standard features of the Model 115 were the System/370 standard and commercial (including decimal arithmetic) instruction sets, and a "direct disk attachment" for IBM 3340 disk drives.
The IBM System/370 Model 115 was announced March 13, 1973 [39] as "an ideal System/370 entry system for users of IBM's System/3, 1130 computing system and System/360 Models 20, 22 and 25." It was delivered with "a minimum of two (of IBM's newly announced) directly attached IBM 3340 disk drives." [39] Up to four 3340s could be attached.
The Model 195 was a reimplementation of the IBM System/360 Model 91 design using monolithic integrated circuits. [1] It offers "an internal processing speed about twice as fast as the Model 85, the next most powerful System/360". [2] The Model 195 was discontinued on February 9, 1977, the same date as the System/370 Model 195.
The first character group is a number representing the heater voltage rounded to the nearest whole number; 0 indicates a cold-cathode tube. [1] One or two letters assigned to the devices in order of development. A single numeral that represents the number of active elements in the tube. Suffix letters distinguish revisions or variants:
[5] Unlike the IBM System/370 Model 145, which as early as June 1971 included the hardware necessary to support virtual memory, and for which a microcode update from a floppy disk, adding support for virtual memory, was announced in 1972, the Model 155 and Model 165 needed expensive hardware additions - $200,000 for the 155 and $400,000 for the ...
Tube bending is any metal forming processes used to permanently form pipes or tubing. Tube bending may be form-bound or use freeform-bending procedures, and it may use heat supported or cold forming procedures. Form bound bending procedures like “press bending” or “rotary draw bending” are used to form the work piece into the shape of a ...
The largest announced model had a 100-fold performance over the smallest model, and the clock frequency ranged from 67-111 MHz (15-9 ns) in the 9021 and 67 MHz in the 9121 to 26-33 MHz (38-30 ns) in the 9221. The 9221 models 120, 130 and 150 were initially available only with the "System/370 Base Option"; the "ESA Option" shipped in July 1991.
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