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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.os.vms
Subject: Re: System UICs
Date: Tue, 11 Jun 2024 03:45:11 -0000 (UTC)
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On 10 Jun 2024 16:26:20 -0400, Rich Alderson wrote:

> "UIC" is a renaming of the concept of project-programmer number, or PPN,
> introduced in DEC systems with the PDP-6, DEC's first multiuser
> mainframe product (April 1964 announcement, June 1964 FCS).

So “PPN” was the term used in TOPS-10 (and whatever the PDP-6 precursor OS 
was), and also RSTS-11/RSTS/E, as well. It was decimal in the latter; was 
it decimal or octal in the PDP-6/10?

“UIC” was the term used in RSX-11, and passed on from there into VMS. That 
was octal in both systems.

A separation of terminology indicating some kind of cultural separation 
within DEC itself?