Re: IBM 9020 FAA/ATC Systems from 1960's

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#210913

From: Anne Lynn Wheeler
Date: Mon, 30 Jul 2001 17:22

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jcmo...@mitre.org (Joe Morris) writes:

> If TS was added to support the ATC requirements, why was it the only
> one of those specialized opcodes to make it into the standard PoO?
> (Perhaps because it alone did not rely on any particular data
> structure that was unique to the FAA software?)

TS was used for multiprocessing support in both 360m65 (os/360) and
360m67 (tss/360 & cp/67). Both predated the ATC work (although ATC may
have taken advantage of some of the 360m65 multiprocessor work).

my understanding was that the 65 & 67 were originally going to be
360m60 and 360m62 ... but somewhere along the line, there was an
upgrade to the memory technology (to 750ns) and the numbers got
changed.

as an aside, the work at cambridge on fine grain locking with cp/67
directly led to compare&swap instruction in 370 (in fact, "CAS" are
the person's initials that did most of the work at cambridge, and
the trick was to come up with a mnemonic that was his initials;
it got modified to CS & CDS tho).

random refs:
http://www.garlic.com/~lynn/subtopic.html#smp

-- 
Anne & Lynn Wheeler   | ly...@garlic.com -  http://www.garlic.com/~lynn/

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Subject: Re: IBM 9020 FAA/ATC Systems from 1960's
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