Job Entry Subsystem 1 (JES1)

Job Entry Subsystem 1 (JES1) was released by IBM to provide for OS/VS1 the basic functions that users of VS1's predecessor, MFT, had when using HASP.


IBM proclaimed[1] JES1 to be "the single most important addition" to the job scheduling provided by VS1. IBM Systems Journal[2] defined JES1's services as Spooling and scheduling, adding "Its three major components are peripheral services, central services, and queue management."; this follows the way HASP operated.

JES1 was not popular,[3]:5 because HASP and ASP users often had made local modifications (edits),[3]:9 and wanted to retain their investment.[4]


JES1 permitted batch jobs to be submitted from remote sites,[5] executed on an IBM mainframe, then produce printed output either at the originating site or, if desired, at the main site or another remote site.[3][6]

New Features

The JOB Card JCL was given a new option: TYPRUN=SCAN, whereby a job could be submitted for quick feedback, and - if no errors were detected - be submitted again (without TYPRUN=SCAN on the JOB Card.[1]:399


  1. T. F. Wheeler, Jr. (1973). IBM OS/VS1 - An evolutionary growth system. International Workshop on Managing Requirements Knowledge. New York, NY. p. 395. doi:10.1109/AFIPS.1973.92.
  2. Baily, J. H.; Howard, J. A.; Szczygielski, T. J. (1974). "The job entry subsystem of OS/VS1". IBM Systems Journal. 13 (3): 253–269. doi:10.1147/sj.133.0253. ISSN 0018-8670.
  3. Tom Wasik. "JES2 Bootcamp - Part 1 of 3: What is JES2 and what does it do" (PDF).
  4. above IBM document, page 5. Also, there was a HASP modification "clearinghouse" at University of Chicago, from which other HASP users "downloaded" (actually printed via RJE and rekeyed ("Keypunched"); this was before the term download was in use).
  5. J. M. Hutchinson (March 1980). Job Networking Facilities (PDF). IBM. GG22-9042-00. RJE is usually part of the system or job entry subsystem
  6. which also (p.7) describes this as being an "early 'client server' which "Uses BSC and SNA protocols," adding "still used today." (2013)
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