On Mon, 10 May 2021 13:35:35 +0000, Seymour J Metz wrote: >Well,VM/XA MA, VM/XA SF, VM/XA/SP and VM/ESA all used subchannel numbers and >couldn't run in S/370 mode, but supported S/370 mode virtual machines. >Somewhere around VM/ESA IBM defined a subset of ESA for optional use by CMS >(or was it GCS?), and I believe that S/370 mode is now gone. What I'm looking >for is the timeline. > IIRC at some point there was a chimeric mode (SET ACCOM370?) that emulated old-fashioned I/O instructions in a generally newer VM.
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