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Line 42: \| date = January 1987}}</ref> mode, IBM changed the I/O architecture to allow the [[Channel Subsystem]] to handle the channel scheduling that the operating system handled in S/370 mode. The new I/O architecture used a 16-bit '''subchannel number''', a 16-bit '''device number''' and an 8-bit '''Channel Path Identifier''' ('''Channel Path Id''' or '''CHPID'''); the [[Channel Subsystem]] was responsible for mapping the '''subchannel number''' to the channel and device numbers, for queuing I/O requests and for selecting from the available paths. Starting with [[IBM zZ#IBM zSeries family\|z990]], IBM introduced the concept of a '''Logical Channel Subsystem'''<ref>{{cite manual \| title = IBM IBM eServer zSeries 990 Technical Guide \| id = SG24-6947-01

Input/Output Configuration Program: Difference between revisions