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SYSIN
Spooled system input in OS/360 and successors From Wikipedia, the free encyclopedia
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In OS/360,[1][2] System Input (SYSIN) datasets are spooled direct-access storage device (DASD) data sets managed by the operating system. They are spooled by system readers, which typically read from card readers, although they can also read from magnetic tape. The support in OS/VS2 R1 (SVS) is essentially the same. The programs Attached Support Processor (ASP) and Houston Automatic Spooling Priority (HASP)[3] usurp the spooling functions of OS/360 and SVS, maintaining SYSIN datasets with their own SPOOL mechanisms.
 | This article relies largely or entirely on a single source. (September 2025) |
| This article needs additional citations for verification. (August 2025) |
 | This Houston Automatic Spooling Priority is currently being merged. There is consensus to merge this page with OS/360 and successors. You can help implement the merge by following the resolution on the discussion and the merging instructions. Process started on July 2025. |
In OS/VS1,[4] SYSIN datasets are managed by Job Entry Subsystem 1 (JES1), retaining many of the same operator commands but replacing the SPOOL mechanism.
In MVS, OS/VS2 R2 and later, SYSIN datasets are managed by a Job Entry Subsystem (JES2 or JES3), retaining many of the HASP or ASP operator commands and providing their own SPOOL mechanisms.
SYSIN also refers to DD * and DD DATA JCL statements, and many programs expect an allocation with ddname SYSIN.
DOS does not support spooling, but several spooling programs are available for it, e.g., Grasp, POWER.
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References
- OS360OpRefOS
- IBM System/360 Operating System: Operator's Reference - OS Release 21 (PDF). Systems Reference Library. IBM. Retrieved July 21, 2025.
- OSVS1Features
- OS/Virtual Storage 1 - Features Supplement (PDF). Systems (First ed.). IBM. August 1972. GC20-1752-0. Retrieved September 2, 2025.
Citations
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