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The structure of SYSTEM/360, Part IV: Channel design considerations

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Control of I/O operations in a multiprogrammed system involves many complicated functions, such as allocation of facilities and protection against mutual interference among programs. In SYSTEM/360, most responsibilities associated with multiprogramming I/O operations, as well as all device dependent functions, are assigned to the programming system, and channel equipment is designed to operate in conjunction with a supervisory program. Channels permit overlapping of CPU and I/O activity and provide general functions more economically implemented in hardware than in software.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Systems Journal  (Volume:3 ,  Issue: 2 )

Date of Publication:

1964

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