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IBM System/370 Model 165

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This is an old revision of this page, as edited by Guy Harris (talk | contribs) at 03:18, 28 December 2016 (Note that the 155, 165, and 195 were the first IBM System/370 machines (so that we link the page for the S/370).). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
ManufacturerInternational Business Machines Corporation (IBM)
Product familySystem/370
Release dateJune 30, 1970 (1970-06-30)
DiscontinuedDecember 23, 1977
WebsiteOfficial website IBM Archives
3 months after the announcement of
the 370/165 (and 155)
came the Model 145.[1]
Unlike the 165 (or 155),
the 145's lack of virtual memory could be rectified with a simple microcode update from a floppy disk, vs the others needing a hardware upgrade.
The IBM 3330
Direct Access Storage Facility,
code-named Merlin, was introduced in June 1970 for use with the IBM System/370. Its removable disk packs could hold 100 MB

The IBM System/370 Model 165 (and the Model 155[2]) were jointly announced June 30, 1970[3] as "designed for ... the Seventies." That same day IBM announced the 370/195.[4] They were the first three models of the IBM System/370 line of computers.

Three months later a fourth IBM System/370, the Model 145, was announced. Since none of them came with virtual memory, "which was to be a hallmark of the 370 line"[5] some said about these early members, of the IBM System/370 family, especially about the 165 & 155, that they were not "the real 370 line."[NB 1]

Growth path

The initially announced System/370 Models 165 & 155 systems were in many ways merely improved IBM System/360 systems.

Upgrade option

In 1972 an upgrade option was announced "to provide the hardware necessary to operate in a virtual memory mode."[8]

Unlike the IBM System/370 Model 145, which as early as June 1971 could have virtual memory capability added to it with a simple microcode update from a floppy disk, the Model 155 and Model 165 needed expensive hardware additions - $200,000 for the 155 and $400,000 for the 165 - to add virtual memory capability, and even this had to wait until 1972. An upgraded 165 was known as an IBM System/370 Model 165-II.[9]

Emulation

The IBM 7070/7074 Compatibility Feature allowed the 165 to "run 7070 and 7074 programs at speeds that, in general, equal or exceed those of the original systems"[10] and yet "not affect normal operation of System/370."[10]: p.5 

See also

Notes

  1. ^ The 195 was noted as "at the time of its introduction, ... IBM's most powerful computing system" and the 145's microcode could be upgraded from a floppy disk. By contrast, the 155 & 165 needed a hardware addition priced at $200,000 and $400,000 respectively
  2. ^ The Model 155 was also enabled to "run under DOS support."

References

  1. ^ "System/370 Model 145". IBM Archives. IBM.
  2. ^ "System/370 Model 155". IBM Archives. IBM.
  3. ^ a b "System/370 Model 165". IBM Archives. IBM.
  4. ^ coming about 14 months after the announcement of the 360/195. Both 195 machines were withdrawn Feb. 9, 1977. see https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP2195.html and https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3195.html
  5. ^ "What Course for the 3081?". Computerworld. November 24, 1980. p. 34.
  6. ^ Robert L. Asenhurst. Foundations of Microprogramming. p. 34. ISBN 1483215873.
  7. ^ Jon Elson (December 5, 2014). "IBM 360/85 vs. 370/165". Newsgroup: alt.folklore.computers.
  8. ^ "First IBM DAT Box Installed". Computerworld. August 15, 1973. p. 17.
  9. ^ A. Padegs (September 1981). "System/360 and Beyond". IBM Journal of Research & Development. 25 (5). IBM: 377–390. doi:10.1147/rd.255.0377. – tables include model characteristics (Table 1) and announcement/shipment dates (Table 2). The S/370-155-II and -165-II are listed under the former but not the latter, because the upgraded systems were not formally announced as separate models. The "System/370 Advanced Function" announcement, including the -158 and -168, was the main public event.
  10. ^ a b "7070/7074 Compatibility Feature for IBM System/370 Models 165, 165 II, and 168" (PDF). IBM. June 1973. GA22-6958-1.
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