IBM System/360 Model 40

IBM System/360 Model 40
Operator Console (B&W)

The IBM System/360 Model 40 was a mid-range member of the IBM System/360 family. It was announced on April 7, 1964, shipped in 1965, and withdrawn on October 7, 1977.[1][2]

360/40 "with circuit gates open"
360/40 configuration

History

April 7, 1964 was the announcement of the then-new IBM System 360, to be available in six models. The top three (60, 62, 70) were never shipped. The 360/40 was the middle of the three (30, 40, 50), which were delivered (mid to late 1965).[3][4][5][6]

Along with the 360/30, these were the two largest revenue producing System/360 units.[7]

Models

Five models[8] of the 360/40 were offered.[9] The D40, E40, F40, G40 and H40 were configured with 16K, 32K, 64K, 128K and 256K of core memory and correspondingly 16, 32, 64, 128 and 128 [10] multiplexer subchannels.[9]

The H40[11] occupied "more floor space than the other models."[9]:p.5

Configuration

A typical, early, basic Model 40 system had the following configuration:[12]

IBM 2040 Central Processing Unit
128K byte storage, storage protection feature, universal instruction set,
one multiplexor channel, two selector channels, and interval timer
IBM 1052 Typewriter- Keyboard (usually assigned to 009 hexadecimal address)
IBM 1442 Card Reader-Punch (00A)
or
IBM 2540 Reader-Punch (00C & 00D)
IBM 1443 Printer (00B)
or
IBM 1403 Printer (00E)
IBM 2311 Magnetic Disk Drives (190 & 191)
or
IBM 2314 Direct Access Storage Facility
Using IBM 1316 or IBM 2316 Disk Packs
IBM 2401 Magnetic Tape Units (180 & 181 for 7-track, and 182 & 182 for 9-track)

If used in a telecommunications environment, the Model 40 also had:

IBM 2701 Communication Controller

IBM 1400 series emulation

With the additional Compatibility Feature hardware and Compatibility Support software under DOS/360, the IBM 1401/1440/1460 object programs could be run in the emulation mode, with little or no reprogramming.[13]

Other

Although the cover of IBM's MVT Guide[14] indicates that even a 360/40 could run MVT, the IBM operating system used was usually the realistically sized DOS/360.[15]

The IBM System/360 Model 40 was developed and manufactured at IBM's facility in Poughkeepsie, U.S.: manufactured in Mainz, Germany; and manufactured in Fujisawa, Japan.

See also

References

  1. ↑ IBM System/360 Model 40 (IBM Archives)
  2. ↑ IBM System/360 model 40 (Flickr from Yahoo!)
  3. ↑ https://books.google.com/books?id=Bc8BGhSOawgC&pg=PA275&lpg=PA275
  4. ↑ From Mainframes to Smartphones, by Martin Campbell-Kelly, Daniel D. Garcia-Swartz; Harvard University Press; ISBN 9780674729063
  5. ↑ https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_FS360.html
  6. ↑ Fortune magazine, Sept. 1966, p.118
  7. ↑ Pugh, Emerson W.; Johnson,, Lyle R.; Palmer, John H. (1991). IBM's 360 and early 370 systems. Cambridge, Mass.: MIT Press. ISBN 9780262161237.
  8. ↑ Lower case "M"
  9. 1 2 3 IBM System/360 Model 40 Functional Characteristics (PDF). August 1971. A22-6881-2.
  10. ↑ not a typo: the physical limit seemed to be 224; see p. 17 of the Model 30 Functional Characteristics
  11. ↑ as per those IBM 1620 systems with larger amounts of memory; Basic Programming Concepts and The IBM 1620 Computer, by Daniel N. Leeson, Donald L. Dimitry, (C) 1962 by Holt, Rinehart and Winston
  12. ↑ IBM System/360 Model 40 Operating Techniques (PDF). IBM. C20-1635-2.
  13. ↑ IBM System/360 Disk Operating System 1401/1440/1460 Emulator Programs: Compatibility Support/30 & /40 (PDF) (Third ed.). IBM. February 1969. C27-6940-2.
  14. ↑ http://bitsavers.trailing-edge.com/pdf/ibm/360/os/R21.7_Apr73/GC28-6720-5_MVT_Guide_Rel_21.7_Aug74.pdf
  15. ↑ Two major reasons: (a) MVT's Minimum memory requirements of 256KB; see http://www.textfiles.com/bitsavers/pdf/ibm/360/mvt/GC28-6551-16_OS_Storage_Estimates_Apr73.pdf. All but one model had less. (b) CPU power; see http://www.os390-mvs.freesurf.fr/mvs360.htm
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