VM/370 Security (and perform

[David S. Green]

[]
As I recall, CMS stood for Cambridge Monitor System and IBM
re-named it Conversational Monitor System.  I believe it
was developed by some MIT guys who went on to form a company
called NCSS ( now D&B Computing or something ).  CMS was a
"friendly" 1960s timesharing system that runs under VM
(Virtual Machine).  Under VM you can run any operating
system you want, as long as you have the 370 code for
it.  CMS is one option.  CP (Control Program) is also
part of the package as are things like BSPP.

IBM developed VM, CP and enhanced CMS.  VM is a system
control program.  It manages the resources of an IBM
370 type computer in such a way that multiple users
have a functional simulation of a computing system
(a virtual machine) at their disposal.  Note that
VM can run many different OSs concurrently.  CP
executes in a real machine controlling the resources
of that machine.  CP is used to create concurrent
virtual machines.
CMS is a single user OS that can execute in one or more
virtual machines.  CMS is considered to be a timesharing
OS.

Hope that clarifies the discussion.
David S. Green Bell Labs ..mhuxi!dsg 201-564-2000



> /***** ea:net.unix-wizards / opus!rcd /  6:57 pm  Dec 21, 1984 */
> OK, OK--I (>>) was being just a teeeeeny bit facetious, and somewhat
> unfair, too.  Specifically, VM was not developed within IBM, though I
> suppose they should get credit for eventually coming around to making it a
> product.
> -- 
> Dick Dunn	{hao,ucbvax,allegra}!nbires!rcd		(303)444-5710 x3086
>    ...Nothing left to do but smile, smile, smile.
> /* ---------- */
> 
> Urk - I just got more confused. I was under the impression that VM had been
> developed at an IBM research lab in the UK, much as Unix was developed in
> an AT&T research lab.
> 
> My reference books are packed, so I can't chase it down. Could somebody
> enlighten me?
> 
> 	<mike