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From: ian@utcs.UUCP (Ian F. Darwin)
Newsgroups: net.unix
Subject: Re: UNIX* on IBM machines running VM
Message-ID: <759@utcs.UUCP>
Date: Mon, 22-Jul-85 13:03:57 EDT
Article-I.D.: utcs.759
Posted: Mon Jul 22 13:03:57 1985
Date-Received: Mon, 22-Jul-85 14:19:07 EDT
References: <1960@sunybcs.UUCP>
Reply-To: ian@utcs.UUCP (Ian F. Darwin)
Distribution: net
Organization: University of Toronto - General Purpose UNIX
Lines: 23
Keywords: UTS/V UTS/N IX/370
Summary:  It's Amdahl+ATT vs IBM

>I am interested in information about UNIX running on IBM machines.
>I am particularly interested in the new AT&T product SYSTEM V-VM and
>how it compares with the Amdol implementation.

The Amdahl (note spelling) port IS the AT&T System V-VM under
a new name. Same product, same performance, same completeness.

This product is now available as Amdahl's UTS/V, running under
VM/SP. There is a `real soon now' version called UTS/N, that runs
native mode; it is only supported on Amdahl hardware (you thought
the diffs between PDP-11 CPUs were bad? look at the diffs between
IBM/370 series CPUs - not in the instruction set so much as in
the `machine check' (hardware error) handling).
A more interesting comparison would be between the Amdahl/AT&T
port and the IBM port, `IX-370'. Among the salient differences,
the Amdahl one supports IBM 3270 terminals, while the IBM one
does not! However, the Amdahl one is not supported on IBM 3705
front-end processors, since Amdahl doesn't own one to test it on.

Anybody have a full, reasonably unbiased comparison between
the two commercially-available ports (there are others, such
as one done for a heavily-modified TSS, that are not really
available outside certain parts of AT&T)?