From: Tom Ivar Helbekkmo via TUHS <tuhs@minnie.tuhs.org>
To: Robert Clausecker <fuz@fuz.su>
Cc: coff@tuhs.org, TUHS@tuhs.org
Subject: Re: [TUHS] Monitoring by loudspeaker
Date: Sun, 23 Aug 2020 10:58:19 +0200 [thread overview]
Message-ID: <m27dtpu4b8.fsf@thuvia.hamartun.priv.no> (raw)
In-Reply-To: <20200712145822.GA72854@fuz.su> (Robert Clausecker's message of "Sun, 12 Jul 2020 16:58:22 +0200")
Robert Clausecker <fuz@fuz.su> writes:
> When the computer is in a tight endless loop, the accumulator takes the
> same series of values every time it's in the loop. Thus, instead of
> white noise you get a sound whose frequency is the clock frequency of
> the machine divided by the number of cycles spent by one loop iteration.
A buddy and I did something somewhat related back in the early eighties,
when we were teaching ourselves programming, using, among other things,
his Tandy TRS-80 home computer. We discovered that a cheap "transistor
radio", sitting close to the computer, would be affected by the noise
generated by it, and then we figured out that if we didn't tune it to a
radio station, we'd get only the noise. Leaving that on as we worked on
a program, we got familiar with the sound of the code, and became able
to follow the execution by the changing patterns -- and if it did get
stuck in a loop somewhere, we'd not only hear it, but we would also have
a pretty good idea where it happened.
-tih
--
Most people who graduate with CS degrees don't understand the significance
of Lisp. Lisp is the most important idea in computer science. --Alan Kay
next prev parent reply other threads:[~2020-08-23 9:09 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 ` [TUHS] Fwd: " Rich Morin
2020-08-23 8:58 ` Tom Ivar Helbekkmo via TUHS [this message]
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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