IBM System/360 Model 20: Difference between revisions

Revision as of 02:29, 11 October 2021

Revision as of 07:58, 27 October 2021

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===2311 Disk Storage===

Model 20 disk storage uses [[History of IBM magnetic disk drives#IBM 2311|IBM 2311 disk drives]], model 11 or 12, attached to an integrated "storage control feature" on the CPU.<ref name=FuncChar />{{rp|pp.58–76}} If multiple drives are attached they have to be the same model. Both models use the 1316 [[disk pack]] which provides a maximum of 203 [[Cylinder (disk drive)|cylinders]] with 10 [[Track (disk drive)|tracks]] per cylinder. The model 11 uses all cylinders, the model 12 uses only the outermost 103. Each track is divided into ten [[Disk sector|sector]]s of 270 bytes each. The model 11 has a formatted capacity of 5.4&nbsp;million bytes, and the model 12 of 2.5&nbsp;million.<ref>[http://www.mirrorservice.org/sites/www.bitsavers.org/pdf/ibm/dasd/2311/Y26-5897-4_2311_FE_Theory_Of_Operation_Oct67.pdf &ldquo;"IBM 2311 Disk Storage Drive Models 1, 11 and 12 Field Engineering Theory of Operation&rdquo;"] describes the IBM 2311, including models 11 and 12, used on System/360 model 20</ref>

===IBM 2560 Multi-Function Card Machine===

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On such systems TPS provides an assembler and tape manipulation utility programs.

Additional capabilities are provided on systems with 8192 bytes of main storage,

and still more with four or more magnetic tape drives.<ref>[http://bitsavers.trailing-edge.com/pdf/ibm/360/model20/C24-9009-3_TPS_OperProcedures_Mar69.pdf IBM System/360 Model 20 Tape Programming System Operating Procedures] &ldquo;"This publication provides Model 20 operators with the information required to operate their systems using the Model 20 Tape Programming System (TPS)&rdquo;"</ref>{{rp|pp.42-43}}

===Card Programming Support===

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==Further reading==

*[http://bitsavers.trailing-edge.com/pdf/ibm/360/model20/E20-0098-0_basicApplications_360-20.pdf ''Basic Applications &mdash; System/360 Model 20 (E20-0098-0)''] "The purpose of this manual is to describe the IBM System/360, Model 20, and show how it may be used to process six basic applications: billing, accounts receivable, sales analysis, inventory control, accounts payable, and payroll."

* [http://bitsavers.informatik.uni-stuttgart.de/pdf/ibm/360/model20/C26-3810-3_360-20_diskUtils_Mar69.pdf IBM System/360 Model 20 / Disk Programming System / Disk Utility Programs] “The"The purpose of this manual is to show you how to use and modify the Disk Utility programs by describing the job-control and utility control statements and indicating the variety of disk operations these programs can perform.”"

*[http://bitsavers.trailing-edge.com/pdf/ibm/360/model20/C24-9006-4_260-20_CtlPgm_Mar69.pdf IBM System/360 Model 20 Disk Programming System Control and Service Programs] "This publication describes the purpose and functions of the Control and Service programs of the IBM System/360 Model 20 Disk Programming System (DPS)."

*[http://bitsavers.trailing-edge.com/pdf/ibm/360/model20/GC26-3602-5_360_20_Card_Programming_Support_Basic_Assembler_Language_Jan71.pdf IBM System/360 Model 20 / Card Programming Support / Basic Assembler Language] “This"This reference publication provides programmers with the information required to write programs in the Basic Assembler language of the IBM System/360 Model 20.”"

{{IBM System/360 line}}