history is hard

Jon Elson elson at pico-systems.com
Fri May 29 16:30:25 CDT 2020

On 05/29/2020 02:38 PM, Noel Chiappa via cctalk wrote:
>      > From: Jon Elson
>      > As far as I know, there was no VM/360. There WAS VM/370, which was out
>      > in the early 1970's
> CP/67, which was a semi-product, and ran only on 360/67's, was basically the
> same functionality as VM/370. (I get the impression that the code was
> descended from CP/67, but I can't absolutely confirm that
I think it was, too.  But, only a /67 could run this.  Any 
other 360 would have big security/reliability problems if 
they tried to implement this kind of virtualization.  
Low-level machines did not even have storage protection 
keys, and on the /40 and /50 (I think) it was an option, 
although I'd guess almost any /50 had it installed.  And, 
the storage protection keys were a very coarse/crude tool, 
although you could set up
sharable read-only areas.

The other issue was that very few 360's had enough storage 
to really use a virtual environment.


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