From: Rich Morin <rdm@cfcl.com>
To: TUHS main list <tuhs@minnie.tuhs.org>
Subject: [TUHS] Fwd: Monitoring by loudspeaker
Date: Sun, 12 Jul 2020 13:10:15 -0700 [thread overview]
Message-ID: <58A78A18-4CD1-4338-A49F-CA2140070328@cfcl.com> (raw)
In-Reply-To: <8cf76d2d-c598-9c5c-3bcc-8b3e0518e313@bitsavers.org>
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On the CDC 3800, the top three bits of the accumulator were scaled and summed by a set of three resistors, then fed into the console speaker. Generally, this produced noise of very little interest (except to indicate that the machine was running).
However, when I ran my Shellsort (https://en.wikipedia.org/wiki/Shellsort <https://en.wikipedia.org/wiki/Shellsort>), the speaker made a very distinctive sound. It was a series of rising tones whose durations got shorter and shorter. Something like Vwooooooooooop, Vwooooooop, Vwooooop, Vroop, ...
-r
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next prev parent reply other threads:[~2020-07-12 20:11 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-11 1:08 [TUHS] AT&T Research John P. Linderman
2020-07-11 1:32 ` Larry McVoy
2020-07-11 1:51 ` John P. Linderman
2020-07-11 15:36 ` Clem Cole
2020-07-11 20:30 ` Warren Toomey
2020-07-11 20:36 ` Jon Steinhart
2020-07-11 21:58 ` Rob Pike
2020-07-11 22:29 ` Larry McVoy
2020-07-12 7:55 ` Ed Bradford
2020-07-12 2:22 ` [TUHS] BTL pranks [was AT&T Research] Doug McIlroy
2020-07-12 11:58 ` [TUHS] Monitoring by loudspeaker (was: BTL pranks) Michael Kjörling
2020-07-12 13:25 ` Dan Cross
2020-07-12 14:58 ` Robert Clausecker
2020-07-12 16:09 ` [TUHS] Monitoring by loudspeaker Al Kossow
2020-07-12 20:10 ` Rich Morin [this message]
2020-08-23 8:58 ` Tom Ivar Helbekkmo via TUHS
2020-07-23 4:13 ` [TUHS] AT&T Research scj
2020-07-23 6:02 ` [TUHS] Technical decisions based on political considerations [was Re: AT&T Research] arnold
2020-07-23 14:42 ` Larry McVoy
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