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IBM System/370 Model 145

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This is an old revision of this page, as edited by Guy Harris (talk | contribs) at 09:22, 12 May 2024 (→Virtual memory: The quote about "not real 370s" specifically mentioned the 155 and 165, which required expensive upgrades in order to run an OS that supported virtual memory, not the 145, which only required a microcode update.). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
IBM System/370 Model 145
IBM System/370 Model 145
ManufacturerInternational Business Machines Corporation (IBM)
Product familySystem/370
GenerationThird
Release dateSeptember 23, 1970 (1970-09-23)
Introductory price$705,775 to $1,783,000
Memorysemiconductor (first IBM use for main memory), 112–512 KB
StorageIBM 3330, IBM 2319
Backward
compatibility		IBM System/360, IBM 1400 series, IBM 7010
WebsiteOfficial website IBM Archives
Render of S/370 Model 145 with typical peripherals
IBM System/370 Model 145 system console
IBM monolithic memory card

The IBM System/370 Model 145 was announced September 23, 1970,[1] three months after the 155 and 165[2] models. It was the fourth member of the IBM System/370 line of computers,[a] and was the first IBM computer to use semiconductor memory for its main memory instead of magnetic core memory.[4] It was described as being five times faster than the IBM System/360 Model 40. First shipments were scheduled for late summer of 1971.[1]

Virtual memory

Unlike the earlier Model 155 and 165 systems, for which an upgrade to virtual memory required the purchase of an expensive upgrade to add a DAT box,[5] the 145's customers had two advantages:

  • 370/145 customers did not have to wait as long for this lack of virtual memory to be remedied[b]
  • there was no need to buy extra hardware: An upgrade to the 145's microcode through a new microcode floppy disk[6] enabled virtual memory capability.

VM/CMS

Upon gaining virtual memory capability via a microcode update, the 145 could now support the VMF (Virtual Machine Facility) and VM/CMS, a time-sharing system.

See also

Notes

  1. ^ A third 370, the 370/195, had separately been announced the same day as the 155 & 165.[3]
  2. ^ June 1971 vs. Aug. 1972

References

  1. ^ a b "System/370 Model 145". IBM Archives. IBM. 23 January 2003. Archived from the original on 2023-07-29.
  2. ^ "System/370 Model 165". IBM Archives. IBM. 23 January 2003. Archived from the original on 2023-07-29.
  3. ^ "System/370 Model 195". IBM Archives. IBM. 23 January 2003. Archived from the original on 2023-07-29.
  4. ^ William D. Smith (September 24, 1970). "A new computer unveiled by I.B.M". The New York Times.
  5. ^ Cite error: The named reference what-course-for-the-3081 was invoked but never defined (see the help page).
  6. ^ IBM Maintenance Library 3145 Processing Unit Theory - Maintenance. IBM. pp. CPU 117–129. SY24-3581-2
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