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Browse Prior Art Database

Alteration of Control Programs Loaded by Read Only Files

IP.com Disclosure Number: IPCOM000076976D
Original Publication Date: 1972-May-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Beard, JN: AUTHOR [+4]

Abstract

Read-only file devices are used for loading of a nonvolatile read/write control storage. The present arrangement provides a suitable means for providing a "patch" capability for the control programs, where the read-only disks are factory-generated and it is desired to reduce the time involved to produce an engineering change.

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Alteration of Control Programs Loaded by Read Only Files

Read-only file devices are used for loading of a nonvolatile read/write control storage. The present arrangement provides a suitable means for providing a "patch" capability for the control programs, where the read-only disks are factory- generated and it is desired to reduce the time involved to produce an engineering change.

The present solution permits the normal control storage load to take place and still retain the patch capability, without having to reenter the patch upon each storage load.

A "reserved" area of control storage is provided, which is untouched during control storage load, where the patch information could be organized. Upon completion of the storage load operation, a program is entered which interrogates the "reserve" portion of storage to perform the integration of the indicated patch into the now resident control program. Additional routines can be added, as well as modification of existing portions of storage. Placing the patch into storage can be done by the service engineer and multiple patches are possible. The drawing illustrates a possible routine for carrying out this solution.

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