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Attached Support Processor

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Attached Support Processor (ASP) is an implementation of loosely-coupled multiprocessing for IBM's OS/360 operating system.[1][2]

ASP evolved from the design of the 7094/7044 Direct Coupled System, using data channel to data channel communication. By attaching an IBM 7044 as a peripheral processor throughput was more than doubled.

ASP was introduced in March 1967, and initially allowed connection of two System/360 computers via a channel-to-channel adapter (CTCA).[3]

In a typical ASP configuration a small mainframe such as a IBM System/360 Model 40 (the support or global system) controlled one or more 360/65 or larger processors (main or local systems). The computers were connected through selector channels on each host attached to channel-to-channel adapters, for an early form of short distance, point-to-point computer networking.

With the introduction of System/370 ASP was renamed Job Entry Subsystem 3 (JES3) and is still in use as of 2014.

References

  1. ^ "Representative ASP Installation". Computerworld. September 13, 1967. Retrieved February 7, 2013.
  2. ^ IBM Corporation (1967). Catalog of Programs for IBM System/360 August 1967 (PDF).
  3. ^ Pugh, Emerson W.; Johnson, Lyle R.; Palmer, John H. (1991). IBM's 360 and Early 370 Systems. MIT Press. p. 710. ISBN 0262161230.

See also

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