Robin Atwood wrote:
On Thursday 21 Aug 2008, John Summerfield wrote:
Evans, Kevin R wrote:
Kinda makes one realize how long z/OS (or its ancestors) has been
around, doesn't it?
MFT?
There was something called PCP that predated MFT but I am happy to say I never
worked on it! :D See: http://en.wikipedia.org/wiki/IBM_mainframe
One of the three OS variants. They used the same JCL and bits not
implemented (eg REGION on MFT and PCP) were checked and otherwise not used.
PCP Primary Control Program. One job at a time, each job has dedicated
use of all disks, tapes etc. I think printing was online, not spooled.
Did not find its way into OS/VS.
MFT Multitasking, Fixed partition sizes. I suspect changing their size
required IPL, at least in earlier versions. In OS/VS, it was VS1.
MVT Multitasking, variable regions. Programs could be "waiting for
region," even between steps if region was specified on the exec card.
Became OS/VS2 Rel 1 (SVS) in OS/VS. ASP and HASP were add-ons.
OS/VS VS2 Rel 2 was the initial release of MVS, and _that_ is what
eventually became z/OS. HASP became JES2 and ASP became JES3.
--
Cheers
John
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