Job Entry Subsystem 1
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
[edit]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]
Features
[edit]JES1 permits operators to submit batch jobs from local unit record equipment.
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
[edit]- 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 SYS1.SYSPOOL 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.
Spooling
[edit]Job Entry Central Services (JECS) does its own I/O for files contained within SYS1.SYSPOOL and provides an Access Control Block (ACB) / Request Parameter List (RPL)[a] API to other services, e.g., Job Entry Peripheral Services (JEPS).[9]
The term system input (SYSIN) refers to
- The JCL for a job
- Instream datasets in the job
- Procedures defined in the job.
A JEPS reader transcribes jobs to SPOOL using JECS but does not interpret them. It stores each instream dataset as a separate file.
The term system output (SYSOUT) refers to
- Print dataset written by the job
- Punch datasets written by the job
- Messsages written on behalf of the job, including an optional transcription of the JCL
A JEPS writer transcribes SYSOUT data set from SPOOL using JECS.
JES1 provides a Compatibility Interfaces that allows jobs to continue to use the old DCB interface; OPEN creates an ACB/RPL pair that the access method uses on behalf of the application.
Notes
[edit]- ↑ VSAM and VTAM introduced te ACB is a replacement for the Data Control Block (DCB), and the RPL as a parameter for I/O macros using the ACB.
References
[edit]- Features
- OS/Virtual Storage 1 - Features Supplement (PDF). Systems (Fourth ed.). IBM. January 1977. GC20-1752-3. Retrieved November 15, 2025.
- Networking
- Hutchinson, John M. (March 1980). Job Networking Facilities (PDF). Technical Bulletin (First ed.). IBM Washington Systems Center. GC24-5090-1. Retrieved November 15, 2025.
- Planing
- OS/VS1 Planning and Use Guide - VS1 Release 2 (PDF). Systems (Second ed.). IBM. January 1973. GC24-5090-1. Retrieved November 15, 2025.
Citations
[edit]- ↑ IBM 3800 Printing Subsystem Programmer's Guide (PDF) (Fourth ed.). IBM. January 1980. GC26-3846-3. Archived (PDF) from the original on 2019-05-25. Retrieved 2020-06-28.
JES1, the job entry subsystem for OS/VS1.
- 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. ISSN 0018-8670.
- 1 2 3 Tom Wasik. "JES2 Bootcamp - Part 1 of 3: What is JES2 and what does it do" (PDF). Archived (PDF) from the original on 2022-12-16. Retrieved 2019-10-06.
- ↑ 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)
- ↑ Planning, p. 18, Remote Entry Services (RES).
- ↑ OS/VS1 Job Management Logic - VS1 Release 2 (PDF). Systems (Second ed.). IBM. January 1973. SY24-5161-1. Archived (PDF) from the original on December 7, 2025. Retrieved July 14, 2026.