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IBM 308X

IBM 308X
IBM 3081
ManufacturerInternational Business Machines Corporation (IBM)
Product familyIBM 3081
IBM 3083
IBM 3084
Release date1980 for the 3081; 1982 for the 3083 & 3084
DiscontinuedAugust 4, 1987 (all 308X)

The IBM 308X is a line of mainframe computers, of which the first model, the Model 3081 Processor Complex, was introduced November 12, 1980.[1][NB 1] It consisted of a 3081 Processor Unit with supporting units.

Later models in the series were the 3083[2] and the 3084.[3] The 3083 was announced March 31 and the 3084 on September 3, both in 1982.

The IBM 308X line introduced the System/370 Extended Architecture[4] (S/370-XA) required by the new MVS/SP V2[5] and the Start Interpretive Execution[6] (SIE) instruction used by the new Virtual Machine/eXtended Architecture Migration Aid[7] (VM/XA MA).

All three 308X systems, which IBM had marketed as "System/370-Compatibles,"[8] were withdrawn August 4, 1987.

  1. ^ "3081 Processor Complex". IBM Archives. IBM. 23 January 2003. Archived from the original on December 26, 2004.
  2. ^ "3083 Processor Complex". IBM Archives. IBM. 23 January 2003. Archived from the original on March 11, 2005.
  3. ^ "3084 Processor Complex". IBM Archives. IBM. 23 January 2003. Archived from the original on December 15, 2004.
  4. ^ IBM System/370 Extended Architecture Principles of Operation (PDF) (Second ed.). IBM. January 1987. SA22-7085-1. Retrieved October 27, 2022.
  5. ^ "IBM Large Systems Announcement Overview" (Announcement letter). IBM. October 21, 1981. LTR ENUS283-042. Retrieved January 19, 2025.
  6. ^ IBM System/370 Extended Architecture Interpretive Execution (PDF) (First ed.). IBM. January 1984. SA22-7095-0. Retrieved October 27, 2022.
  7. ^ "Virtual Machine/eXtended Architecture Migration Aid" (Announcement letter). IBM. October 21, 1981. ZP81-0811. Retrieved January 19, 2025.
  8. ^ "IBM Archives: System/370-Compatibles Dates and characteristics". 23 January 2003. Archived from the original on January 16, 2005.


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