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Operating System Incorporating a Sysout Writer for a Plotter

IP.com Disclosure Number: IPCOM000075403D
Original Publication Date: 1971-Sep-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

McCracken, CT: AUTHOR

Abstract

An IBM 1627 plotter is connected on-line to an MVT version of an operating system by allowing the plotter to be handled within the SYSOUT class of devices.

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Operating System Incorporating a Sysout Writer for a Plotter

An IBM 1627 plotter is connected on-line to an MVT version of an operating system by allowing the plotter to be handled within the SYSOUT class of devices.

When it is desirous to utilize an on-line plotter, an input data control block (DCB) is opened at 11. The current task control block (TCB) task I/O table (TIOT) pointer is retained at 13, and the field of the current TCB is replaced by the TIOT pointer from the Attach list at 15. This TIOT belongs to the mother or originating task. The plotter data control block is thereafter opened at 17, and the system is ready for the reading of queued records and the writing of the same records on the plotter. Thus, the input records are obtained at 19, and a test is made to determine whether an end-of-file has been reached at 12. If the end-of- file has not been reached, the accessed input record is executed on the plotter at 23 and the next input record is accessed. When the end-of-file is reached as noted at block 21, the data sets are closed at 24, and the original TCB TIOT is restored at 25.

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