Editing BOS/360

{{Short description|Early IBM System/360 operating system}}
{{Infobox OS
| name                   = Basic Operating System/360 (BOS/360)<!-- Name of program or distribution -->
| logo                   = IBM logo.svg
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| logo size              = 120px
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| collapsible            = 
| version of             = <!-- For articles about releases of operating systems ONLY -->
| developer              = [[IBM]] General Products Division (GPD)<!-- Name of main developer or sponsor-->
| family                 = <!-- "Unix-like" or "Microsoft Windows" -->
| working state          = Discontinued<!-- "Current", "Discontinued" (operating systems), or "No longer supported" (releases) -->
| source model           = <!-- "Open source", "Closed source", or "Shared source" -->
| released               = {{Start date and age|1965|10}}
| discontinued           = <!-- DON'T use this for articles about releases of operating systems -->
| RTM date               = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} ONLY for articles about OS releases -->
| GA date                = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} ONLY for articles about OS releases -->
| latest release version = 
| latest release date    = 
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| latest preview date    = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} -->
| marketing target       = [[IBM mainframes|IBM mainframe computers]]
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| language               = [[English language|English]]<!-- Supported human languages (English, French, Italian, Arabic, ...) -->
| update model           = <!-- APT, Windows Update, etc. -->
| package manager        = <!-- dpkg, rpm, Windows installer, etc. -->
| supported platforms    = [[IBM System/360|System/360]]<!-- IA-32, x64, Itanium, ARM, etc. -->
| kernel type            = <!-- Hybrid, Monolithic, Microkernel, Exokernel, Nanokernel, etc. -->
| userland               = 
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| license                = [[Proprietary software|Proprietary]]
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| website                = <!-- {{URL|www.example.org}} -->
| support status         = <!-- For articles about releases of operating systems ONLY -->
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}}
{{History of IBM mainframe operating systems|misc}}
'''Basic Operating System/360'''  ('''BOS/360''') was an early [[IBM System/360]] [[operating system]].

== Origin ==
BOS was one of four System/360 Operating System versions developed by the IBM General Products Division (GPD) in [[Endicott, New York]] to fill a gap at the low end of the System/360 line when it became apparent that OS/360 was not able to run on the smallest systems. [[IBM Basic Programming Support|BPS (Basic Programming support)]] was designed to run on systems with a minimum of 8&nbsp;KB of main storage and no disk.  BOS was intended for disk systems with at least 8&nbsp;KB and one [[IBM 2311|2311]] disk drive.<ref>{{cite book |last1=IBM Corporation |title=IBM System/360 Basic Operating System Programmer's Guide |date=Sep 1967 |url=http://bitsavers.org/pdf/ibm/360/bos_bps/C24-3372-6_BOSpgmr_Sep67.pdf |access-date=Jan 24, 2022}}</ref> [[DOS/360 and successors|DOS and TOS]] were developed from BOS for systems with at least 16&nbsp;KB and either disks (DOS) or [[Magnetic tape|tape drives]] only (TOS).

BOS was released in October 1965, nearly two years before OS/360,<ref>Pugh, Emerson, et al. "IBM's 360 and Early 370 Systems". MIT Press, 1991, p. 331</ref> thus BOS was the only disk based operating system available at launch for a machine that was marketed as disk based.

== Components ==
BOS consisted of the following components:
* Control programs:
** The [[Supervisory program|supervisor]].
** [[Job Control Language|Job control]] capable of running jobs sequentially from the card reader.
** The [[Initial Program Load#IBM Initial Program Load|IPL]] loader.
* System Service Programs:
** The [[Linkage editor|Linkage Editor]].
** The Librarian, supporting a core-image library, and optionally a macro library and a relocatable library.
** The "Load System Program," a [[sysgen]] program to build a disk-resident BOS system from cards.
* IBM-supplied processing programs which could be installed with BOS:
** Language translators, an [[Assembler (computer programming)#Assembler|Assembler]] and an [[IBM RPG|RPG]] compiler.  Compilers for [[FORTRAN IV]] and [[COBOL]] were added later.
** Autotest, a debugging aid.
** Sort/Merge.
** Utility programs for file-to-file copy between devices and formats.
** [[Remote job entry|Remote Job Entry]] allowing the BOS system to submit jobs to a remote System/360 and receive output.
* Data Management, consisting of supervisor support for Physical [[IOCS]], and macros for Logical IOCS which could be incorporated into the user's processing programs.

== IBM 1070 Process Communication Supervisor ==
The [[IBM 1070]] Process Communication Supervisor was a dedicated [[Industrial control system|process control system]] that ran as an extension under BOS "Relying on the BOS supervisor to handle ordinary physical and logical I/O operations (i. e., for cards, disk, etc.), the PC supervisor is specialized to the process control aspects of the user's program."<ref>{{cite book|last=IBM Corporation|title=IBM System/360 Basic Programming Support and Basic Operating System/360 Programming Systems Summary (C24-3420-0).|year=1965|url=http://www.bitsavers.org/pdf/ibm/360/bos_bps/C24-3420-0_BPS_BOS_Programming_Systems_Summary_Aug65.pdf}}</ref>

== References ==
{{Reflist}}

== Further reading ==
*Pugh, Emerson W.; Johnson, Lyle R.; Palmer, John H. (1991). [https://books.google.com/books?id=MFGj_PT_clIC&q=IBM%27s+360 ''IBM's 360 and Early 370 Systems''], Cambridge : MIT Press. (pp.&nbsp;321–345)

{{IBM operating systems}}

{{DEFAULTSORT:BOS 360}}
[[Category:IBM mainframe operating systems]]
[[Category:Discontinued operating systems]]
[[Category:Assembly language software]]
[[Category:1965 software]]