[TUHS] UNIX on S/370

Charles H Sauer sauer at technologists.com
Tue Nov 21 02:47:29 AEST 2017

I was waiting for Clem to weigh in on this, since I assume he knows more about it than I do.

I wasn’t paying much attention to Unix on 370, but my impression has always been that there were multiple 370 ports. The only ones that were completed, to my knowledge, were the ESS one and AIX/370. I don’t know of the ESS one being available outside of AT&T.

I don’t know anything about the compilers used, would assume they were PCC-based, even if provided by IBM.

In 1989, when I left IBM, there were certainly plenty of 370 people inside IBM that would have understood 370 channels. I would have thought that to still be true in 1991, even with the buyout packages that encouraged people to retire. (It wasn’t until Gerstner became CEO in April 1993 that IBM abandoned the “full employment” traditions.)

What Clem says about the smaller footprint of devices rings true. There were also likely customers that wanted to run AIX alongside other VMs, just as there were customers who wanted to run MVS alongside other VMs.


From: Clem Cole 
Sent: Monday, November 20, 2017 10:37 AM
To: Noel Chiappa 
Cc: The Eunuchs Hysterical Society 
Subject: Re: [TUHS] UNIX on S/370

On Mon, Nov 20, 2017 at 11:05 AM, Noel Chiappa <jnc at mercury.lcs.mit.edu> wrote:

  Maybe this is my lack of knowledge of VM showing, but how did having VM help
  you over running on the bare hardware?

​As an IBM person, I would ask Charlie to answer here, but I believe the answer from the Locus side was tools​ primarily and I also think they did not have to support as much specific HW (i.e. smaller foot print of devices).
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