The original CMS could run on a real machine. Prior to GCS, VTAM support was via VCNA communicating with VTAM on a guest. OS/VS1 needed BPE for hat configuaration.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 עַם יִשְׂרָאֵל חַי נֵ֣צַח יִשְׂרָאֵ֔ל לֹ֥א יְשַׁקֵּ֖ר ________________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Len Rugen <[email protected]> Sent: Friday, June 5, 2026 4:01 PM To: [email protected] <[email protected]> Subject: Re: GC20-1757 - IBM Virtual Machine Facility/370 Features Supplement External Message: Use Caution IIRC, many of these, like CMS, wouldn't IPL on physical hardware. I remember thinking one of these (VTAM?) looked like a OS/VS1 single pack system... Len Rugen rugenl at yahoo.com GPG Public Key On Friday, June 5, 2026 at 02:59:48 PM CDT, Paul Gilmartin <[email protected]> wrote: On Fri, 5 Jun 2026 10:58:54 -0500, Paul Schuster wrote: >That is fascinating. I did not know that RSCS used to be an IPLable system. > ... Jargon. Roughly, the analogue of a z/OS started task is a VM service virtual machine. Those are started by (virtual) IPL, and RSCS is one of such. -- 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 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
