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From: esf00@amdahl.amdahl.com (Elliott S. Frank)
Newsgroups: comp.arch
Subject: Historical correction (was Re: Horizontal pipelining)
Message-ID: <18624@amdahl.amdahl.com>
Date: Mon, 23-Nov-87 12:15:21 EST
Article-I.D.: amdahl.18624
Posted: Mon Nov 23 12:15:21 1987
Date-Received: Thu, 26-Nov-87 02:35:27 EST
References: <201@PT.CS.CMU.EDU> <388@sdcjove.CAM.UNISYS.COM> <988@edge.UUCP> <393@sdcjove.CAM.UNISYS.COM> <3801@ptsfa.UUCP>
Reply-To: esf00@amdahl.amdahl.com (Elliott S. Frank)
Organization: The Beige Building Full of Bright Engineers, Inc.
Lines: 39
Keywords: multiple users

In article <3801@ptsfa.UUCP> dmt@ptsfa.UUCP (Dave Turner) writes:

>>In article <988@edge.UUCP> doug@edge.UUCP (Doug Pardee) writes:
>>>OS/MFT became (was the basis for) OS/VS1.  OS/MVT was the basis for OS/VS2.
>>>Release 2 of OS/VS2 was the first MVS.  Inevitably, OS/VS2 Release 1 became
>>>known to history as SVS.
>
>I thought that OS/VS1 was called SVS.
>
Some taxonomy:

OS/PCP (Primary Control Program == real memory single task OS/360) -->
        evolutionary dead end

OS/MFT (Multiprogramming with a Fixed number of Tasks == real memory
        operating system assigning a memory partition for each "job step"
        task)  -->
        OS/VS/1 [24-bit fixed partition operating system] -->
                evolutionary dead end

OS/MVT (Multiprogramming with a Variable number of Tasks == real memory
        operating system assigning necessary memory for each "job step"
        task) -->
        OS/VS/2 [24-bit dynamic partitioned operating system]

        OS/VS/2 Release 1 == SVS (Single Virtual System == 24-bit virtual
                address space dynamically partitioned among active
                "job step" tasks)

        OS/VS/2 Release 2 == MVS (Multiple Virtual Spaces == created
                24-bit address space for each "job step" task)

And what is a "job step" task?  Ah, ...     :-)
-- 
Elliott Frank      ...!{hplabs,ames,sun}!amdahl!esf00     (408) 746-6384
               or ....!{bnrmtv,drivax,hoptoad}!amdahl!esf00

[the above opinions are strictly mine, if anyone's.]
[the above signature may or may not be repeated, depending upon some
inscrutable property of the mailer-of-the-week.]