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I have been doing some work on this article and noticed that this article overlaps Channel I/O and, to some extent Count key data. The latter is strictly DASD, while it seems like the former should be less IBM-centric. On the other hand the topic of this article is the EXCP macro, and perhaps not the internals of CCWs. There seems to be no place where the CCW information fits well, but perhaps Channel I/O and Count key data have too much detail. I think we need another article to consolidate System/360 (and later) I/O processing and strip the excess out of these three articles. I don't know what such an article should be called. Peter Flass (talk) 16:18, 6 December 2019 (UTC)[reply]
