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{{about|Input/Output Configuration Program|the IOCP API|Input/output completion port}}
{{Infobox software
Input/Output Configuration Program (IOCP)<ref>Input/Output Configuration Program User's Guide and ESCON Channel-to-Channel Reference, GC38-0401</ref><ref>Stand-Alone IOCP User's Guide, GC38-0456▼
| name = Input/Output Configuration Program
| title = Input/Output Configuration Program
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| author = IBM
| developer = IBM
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| operating system = stand alone, z/OS, z/VSE
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| license = Proprietary
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In the original [[IBM System/360|S/360]] and [[IBM System/370|S/370]] architectures, each processor had its own set of I/O channels and the operating system had to be configured to reflect what devices were connected to what channels. Initiating an I/O to a channel on a different processor required a [[shoulder tap]] to interrupt it so that it could initiate the I/O.
Starting with the [[IBM 3081]] and [[IBM 4381]] in [[S/370 Extended Architecture]] mode, IBM introduced software configurable [[Channel Subsystem]]s, and allowed the operator to select an [[Input/Output Configuration Data Set]] (IOCDS) as part of of a [[Power On Reset]] (POR). Input/Output Configuration Program (IOCP)<ref name=GC38-0401/><ref name=GC38-0456/> is a program for IBM mainframes that compiles a description of the [[Channel Subsystem]] and [[LPAR]] configuration, optionally loading it into an [[Input/Output Configuration Data Set]] (IOCDS); it recognizes the syntax of [[MVS Configuration Program]] (MVSCP)<ref name=GC28-1615/> input, and there is no need to maintain separate input files.
The direct use of IOCP and [[MVS Configuration Program | MVSCP]] has been mostly supplanted by [[Hardware Configuration Definition | Hardware Configuration Definition (HCD)]]<ref name=GA22-7525/>
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== References ==
<!--- See http://en.wikipedia.org/wiki/Wikipedia:Footnotes on how to create references using <ref></ref> tags which will then appear here automatically -->
{{Reflist
<ref name=GA22-7525>
{{cite manual
| author = IBM
| title = z/OS Hardware Configuration Definition Planning
| id = GA22-7525-13
| url=http://publibz.boulder.ibm.com/epubs/pdf/iea2g890.pdf
| separator = ,
}}
</ref>
<ref name=GC28-1615>
{{cite manual
| author = IBM
| title = MVS Configuration Program
| id = GC28-1615
| separator = ,
}}
</ref>
<ref name=GC38-0401>
{{cite manual
| author = IBM
▲
| id = GC38-0401
| url = http://publibfp.dhe.ibm.com/cgi-bin/bookmgr/BOOKS/da4a4001/CCONTENTS
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}}
</ref>
<ref name=GC38-0456>
{{cite manual
| author = IBM
| title = Stand-Alone IOCP User's Guide
| id = GC38-0456
| separator = ,
}}
</ref>
}}
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