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From: rpw3@fortune.UUCP
Newsgroups: net.unix-wizards
Subject: IBM 1410 nostalgia - (nf)
Message-ID: <3250@fortune.UUCP>
Date: Sun, 6-May-84 15:10:29 EDT
Article-I.D.: fortune.3250
Posted: Sun May  6 15:10:29 1984
Date-Received: Mon, 7-May-84 01:10:27 EDT
Sender: notes@fortune.UUCP
Organization: Fortune Systems, Redwood City, CA
Lines: 35

#N:fortune:11600093:000:1621
fortune!rpw3    May  6 04:22:00 1984

The flury of IBM 1620 stories prompted an off-line mail exchange,
where the subject drifted to IBM 1410's. (How many people know
what ^L%B000012$^N means, given that "^" is really upside down over
the the following character?) The story below seemed worth posting for
nostalgia, if nothing else.
----------------

The 1410 I worked on. I wired a speaker to the "Zero Balance" light; said
light went on whenever a compare got "equal" or a sum or difference got a
zero result. The sounds you got from it were VERY useful in knowing what was
going on in the machine. You could hear it down the hall in the operators
"break room", so you could leave the card reader or printer off until you
heard the characteristic harsh buzz of the IOCS waiting for the "off-line"
to be cleared, then come back to turn them on. (We were charged for our
maintenance contract by "on line" time by IBM, which is why the off/on hassle.)

Similarly, when one of the numerical analysts came down to see how his six
hour non-linear regression was going, you could tell him quite a bit from
the sound.  The main loop of the NLE program had a distinctive "squishing"
sound.  As convergence of the matrix relaxation approached, the "squishes"
got closer and closer together. In fact, when they were almost continuous,
you walked over and turned on the printer, 'cause it was about to print out
the answer!

[That should bring back some memories, eh, Peter? <ospwd@emoryu1>]

Rob Warnock

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