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Execute Channel Program : ウィキペディア英語版
Execute Channel Program

In IBM mainframe operating systems, Execute Channel Program (EXCP) is a supervisor call for low-level device access, where the programmer is responsible for providing a list of device-specific CCWs, that is, a channel program, to be executed by I/O channels, control units and devices. EXCP is more specifically described in the OS System Programmer's Guide.〔http://www.bitsavers.org/pdf/ibm/360/os/R01-08/C28-6550-2_OSsysPrmg_Mar67.pdf〕
==Specifying Datasets==
Using EXCP, legacy devices and legacy datasets may be operated on with relatively high performance. EXCP devices are OPENed (that is, are made available to the application) by specifying MACRF=(E) in the Data Control Block.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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