Yes, but when did CMS and GCS stop requiring it?
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [[email protected]] on behalf of Paul Gilmartin [[email protected]] Sent: Monday, May 10, 2021 9:52 AM To: [email protected] Subject: Re: When did CMS stop requiring S/370 mode? 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. -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
