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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.os.linux.misc,alt.folklore.computers
Subject: Re: The joy of FORTRAN
Date: Wed, 25 Sep 2024 02:40:37 -0000 (UTC)
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On Tue, 24 Sep 2024 16:05:25 -1000, Lynn Wheeler wrote:

> ... some of the MIT CTSS/7094 went to Project MAC on the 5th flr to do
> MULTICS ...

Let’s see ... “CTSS” (Corbatò et al) stood for “Compatible Time Sharing 
System”, the “Compatible” part meant that it could not interfere with 
batch workloads run under the IBM-proprietary OS on the same hardware.

Later some hackers at MIT created their own OS for the PDP-10 and named it 
“Incompatible Timesharing System” (ITS) as a sort of anti-homage to 
CTSS. ;)

(You thought “MULTICS”/“UNICS” (later “UNIX”) was the only pun of its type 
to come out of the ferment of OS development in the 1960s?)