Just out of pure curiosity, I wonder if there are any surviving copies of that “bare metal” CMS system and its documentation outside of IBM deep archives (i.e., gathering dust at Iron Mountain).
It would be interesting to bring it up under S/370 emulation or on a surviving P370 system if anyone has one that’s still operational, just to see it work, but probably also somewhat frustrating without the supporting documentation. Peter From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Mark S Waterbury Sent: Friday, June 19, 2026 10:39 PM To: [email protected] Subject: Re: GC20-1757 - IBM Virtual Machine Facility/370 Features Supplement The original "CMS" (Cambridge Monitor System) of CP-67 could run on a "bare" machine, and this was used to do the initial "SYSGEN" of CP-67, e.g. to specify the I/O configuration etc. to install CP-67 on an IBM S/360 model 67. By the time VM/370 became available in late 1972 or early 1973, the VM version of "CMS" (Conversational Monitor System) could no longer run on any "bare" machine as it relied on a number of CP services provided via the DIAGnose instruction (aka. the "hypervisor call" in today's lingo.) -- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
