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From: Lynn Wheeler <lynn@garlic.com>
Newsgroups: comp.os.linux.misc,alt.folklore.computers
Subject: Re: The joy of FORTRAN
Date: Wed, 25 Sep 2024 07:17:39 -1000
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rbowman <bowman@montana.com> writes:
> Gary Kildall may have been doing that with PL/M, Programming Language for 
> Microprocessors. It did have some PL/I DNA.

before ms/dos
https://en.wikipedia.org/wiki/MS-DOS
there was Seattle computer
https://en.wikipedia.org/wiki/Seattle_Computer_Products
before Seattle computer, there was cp/m
https://en.wikipedia.org/wiki/CP/M
before developing cp/m, kildall worked on IBM cp/67-cms at npg
https://en.wikipedia.org/wiki/Naval_Postgraduate_School

(virtual machine) CP67 (precursor to vm370)
https://en.wikipedia.org/wiki/CP-67
other (virtual machine) history
http://www.leeandmelindavarian.com/Melinda#VMHist

-- 
virtualization experience starting Jan1968, online at home since Mar1970