On Mon, 10 May 2021 12:56:42 +0000, Seymour J Metz <[email protected]> wrote:

>CMS originally ran on a real S/360 or on a S/60 virtual machine under CP-67. 
>The CMS for VM/370 through VM/SP ran on a virtual S/370. When did CMS stop 
>requiring S/370 mode and when did it stop supporting S/370 mode (if it did)?
>
>
>
>--
>Shmuel (Seymour J.) Metz
>http://mason.gmu.edu/~smetz3

CMS Release 12, (VM/ESA 2.1.0), and later releases of CMS no longer supported 
running CMS in 370 Mode.
z/VM 4.1.0 and later releases no longer supported 370 mode Virtual Machines, 
(and therefore could no longer run 370 mode only OSes).

-- 
Dale R. Smith

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