Browse Prior Art Database

File Catenation

IP.com Disclosure Number: IPCOM000075583D
Original Publication Date: 1971-Oct-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Blackwell, WW: AUTHOR [+5]

Abstract

This technique permits access to a plurality of peripheral devices such that they appear to a user as a single file. From an initial channel control word (CCW), a number of CCW's, each corresponding to one of the peripheral devices, are generated by the channel control unit. These all contain the same command code, flag field and byte count as the initial CCW. The data address field, however, contains the original CCW data address plus a multiple of the byte count, so that each channel that will be operated simultaneously is associated with a different portion of main store. Following the generation of the CCW's, the channel control unit controls data transmission between the plurality of peripheral units and main store over the selector channels.

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File Catenation

This technique permits access to a plurality of peripheral devices such that they appear to a user as a single file. From an initial channel control word (CCW), a number of CCW's, each corresponding to one of the peripheral devices, are generated by the channel control unit. These all contain the same command code, flag field and byte count as the initial CCW. The data address field, however, contains the original CCW data address plus a multiple of the byte count, so that each channel that will be operated simultaneously is associated with a different portion of main store. Following the generation of the CCW's, the channel control unit controls data transmission between the plurality of peripheral units and main store over the selector channels.

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