Channel control system having device control block and corresponding device control word with channel command part and I/O command part
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United States of America Patent
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-
Jul 9, 1991
Issued Date -
N/A
app pub date -
Nov 8, 1989
filing date -
Jul 31, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device control word including a channel command part and an I/O command part is prepared in a main storage unit, and sent to a channel unit together. The channel command part has a common format for different types of I/O devices or I/O controllers thereof, while the I/O command part may have a different format for each type of the I/O devices. Thereby, the same channel unit can be used for or connected to different kinds of I/O controllers by simply modifying software in a central processing unit to correspond to respective I/O controllers.
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