Execute Channel Program: Difference between revisions

Revision as of 15:35, 16 March 2025

Latest revision as of 10:12, 13 May 2025

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| isbn=978-0-07-032673-6

| page=558

}}</ref><ref>{{cite manualbook

| publisher = IBM

| title = z/OS Version 2 Release 4 DFSMSdfp Advanced Services

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| url = https://www.ibm.com/servers/resourcelink/svc00100.nsf/pages/zOSV2R4sc236861/$file/idas300_v2r4.pdf

| id = SC23-6861-40}}

</ref> is more specifically described in the OS System Programmer's Guide.;<ref>{{cite manualbook|publisher=IBM|title=IBM System/360 Operating System System Programmer's Guide|id=C28-6550-2|date=March 1967|url=http://www.bitsavers.org/pdf/ibm/360/os/R01-08/C28-6550-2_OSsysPrmg_Mar67.pdf}}</ref> EXCP for [[DOS/360 and successors]]<ref name="Stotts1990">{{cite book

| author=Gary A. Stotts

| title=DOS/VSE: Introduction to the Operating System

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| isbn=978-0-89435-332-1

| page=18

}}</ref> is more specifically described in DOS Supervisor and I/O Macros.<ref name=GC24-S037-12>{{cite manualbook

| title = DOS Supervisor and I/O Macros

| id = GC24-S037-12

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}}

</ref><ref name=SC34-2709>

{{cite manualbook

| publisher = IBM

| title = IBM z/VSE Version 6 Release 1 System Macros User's Guide

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==Channel programs==

System/360 channel programs are a sequence of commands which are executed by the channel and the I/O device. Channel programs can be located anywhere in main storage. The channel program is a sequence of ''Channel Command Words'' (CCWs), which may be executed sequentially unless a branch, called ''Transfer In Channel'' (TIC), is executed, or the channel returns a [[IBM System/360 architecture#CSW Status modifier|status modifier]]. Each CCW is a doubleword (eight bytes) as follows:{{sfn|S360|loc=[[http://bitsavers.org/pdf/ibm/360/princOps/A22-6821-6_360PrincOpsJan67.pdf#page=87 Input/Output Operations]]|pp=84-121}}{{efn|Successorss add additional flags and formats

;[[IBM System/370|System/370]] with Dynamic Address Translation

:Adds the Channel Indirect Data Addressingfeature{{sfn|S370|loc=[http://bitsavers.org/pdf/ibm/370/princOps/GA22-7000-10_370_Principles_of_Operation_Sep87.pdf#page=396 CHANNEL INDIRECT DATA ADDRESSING]|pp=13-45-13-46}} and the Indirect Data Address{{sfn|S370|loc=[http://bitsavers.org/pdf/ibm/370/princOps/GA22-7000-10_370_Principles_of_Operation_Sep87.pdf#page=389 CHANNEL-COMMAND WORD]|p=13-38}} CCW flag.

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}}

;DFSMSdfp

:{{cite manualbook

| title = z/OS Version 2 Release 4 DFSMSdfp Advanced Services

| date = August 2020