Job Entry Subsystem 1 Explained
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.
History
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] because HASP and ASP users often had made local modifications (edits),[4] and wanted to retain their investment.[5]
Features
JES1 permitted operators to submit batch jobs from local unit record equipment.
In addition, Remote Entry Service (RES) permitted 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]
- JES1 used a SubSystem Interface (SSI) similar to that in MVS.
Notes and References
- IBM 3800 Printing Subsystem Programmer's Guide . GC26-3846-3 . January 1980 . Fourth . JES1, the job entry subsystem for OS/VS1. . IBM .
- IBM OS/VS1 - An evolutionary growth system. T. F. Wheeler, Jr.. International Workshop on Managing Requirements Knowledge. New York, NY. 1973. 10.1109/AFIPS.1973.92. 395. AFIPS.
- Baily. J. H.. Howard. J. A.. Szczygielski. T. J.. The job entry subsystem of OS/VS1. IBM Systems Journal. 13. 3. 1974. 253–269. 0018-8670. 10.1147/sj.133.0253.
- Web site: JES2 Bootcamp - Part 1 of 3: What is JES2 and what does it do. Tom Wasik.
- 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).
- IBM . Redbooks . Job Networking Facilities . J. M. Hutchinson . March 1980 . GG22-9042-00 . 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)
- OS/VS1 Planning and Use Guide . GC24-5090-1 . Remote Entry Services (RES) . 18 . January 1973 . Second . IBM .