Browse Prior Art Database

Multifunction Unit Record Device

IP.com Disclosure Number: IPCOM000074915D
Original Publication Date: 1971-Jun-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Conway, AJ: AUTHOR [+2]

Abstract

Each function of a multifunction I/O device such as a card reader-punch-print device is treated as a logically separate file or data set. This allows each data set to be handled as normal input or output - thus gaining the same degree of device independence and language/compiler transparency as single-function devices.

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Multifunction Unit Record Device

Each function of a multifunction I/O device such as a card reader-punch-print device is treated as a logically separate file or data set. This allows each data set to be handled as normal input or output - thus gaining the same degree of device independence and language/compiler transparency as single-function devices.

The user defines a READ data set, PUNCH data set, and PRINT data set. The data management control block structure is built for three data sets instead of one. This can allow the High Level Language programmer to perform multiple functions in a device without necessitating language or compiler changes. This approach eliminates the need for special data management routines, which handle combined GETs and PUTs on the same unit record data set.

In order to facilitate command sequence checking (if the functions must be performed in a given order) the Data Management control blocks must be chained in such a manner that the control blocks for all of the functions may be accessed when a request for any one particular function is being processed.

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