Job Entry Subsystem (JES),[1] aka Job Entry Subsystem 1 (JES1), was released by IBM as an integral part of OS/VS1 as an enhancement to the basic functions that users of VS1's predecessor, MFT, had.
IBM proclaimed[2] JES1 to be "the single most important addition" to the job scheduling provided by VS1. IBM Systems Journal[3] defined JES1's services as Spooling and scheduling, adding "Its three major components are peripheral services, central services, and queue management."
JES1 was not popular,[4]:5 because HASP and ASP users often had made local modifications (edits),[4]:9 and wanted to retain their investment.[5]
In addition, Remote Entry Service (RES) permits remote operators to submit jobs from remote sites[6] to JES. The printed and punched output of jobs running on OS/VS1, whether submitted locally or remotely, is handled by JES and may be routed to local devices, to the originating site or to another remote site.[4][7] The Remote Entry Services (RES)[8] of OS/VS1 is similar to Remote Job Entry (RJE) on OS/360 but the protocol for programmable workstations is that used by HASP II and ASP rather than that used by RJE.
New Features
In MFT a reader or writer task tied up a partition; in JES1 a separate partition was required only while starting or stopping the task.
In MFT each SPOOL file was a separate physical sequential (PS) dataset on public DASD; in JES1 SPOOL files are kept in a common SPOOL dataset managed by JES1.
In MFT a reader task could be delayed by interpreting tasks; in OS/VS1 the interpretation is done when the job is initiated.
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.[2]:399
JES1 used a SubSystem Interface (SSI) similar to that in MVS.
Hutchinson, John M. (March 1980). Job Networking Facilities(PDF). Technical Bulletin (Firsted.). IBM Washington Systems Center. GC24-5090-1. Retrieved November 15, 2025.
1 2 T. F. Wheeler, Jr. (1973). IBM OS/VS1 - An evolutionary growth system. International Workshop on Managing Requirements Knowledge. New York, NY: AFIPS. p.395. doi:10.1109/AFIPS.1973.92.
↑ 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. ISSN0018-8670.
↑ above IBM document, page 5. Also, there was a HASP modification "clearinghouse" at University of Chicago, from which other HASP users "downloaded" (actually printed[citation needed]. via RJE and rekeyed ("Keypunched"); this was before the term download was in use).
↑ Networking, p.13, 2.0 Remote Job Entry - Product Comparisons -- 2.1 Characteristics/Design Objectives "RJE is usually part of the system or job entry subsystem"
↑ 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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