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From: Paul Winalski <>
To: Bakul Shah <>
Subject: [COFF] Re: Music!
Date: Fri, 10 Feb 2023 16:09:15 -0500	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 2/10/23, Bakul Shah <> wrote:
> Somewhat related: there was enough RF leakage when the Fortune motherboard
> was not in the case. I could "tune into it" near a Jazz FM station.

Stan Rabinowitz, longtime member of DEC's PDP-8 software group,
discovered that the same could be done with the PDP-8.  He wrote a
program to play music on the PDP-8 that way.

> That was
> quite useful because the noise pattern changed depending on what the system
> was doing.

Back when I was in grad school my hearing was keen enough that I could
hear the high-pitch noise of television set vertical retrace and
acoustic burglar alarm systems.  The power supply on the VAX-11/780
emitted a steady sound at about 15KHz, which I could hear.  The pitch
varied depending on what the system was doing.  There was a particular
sequence of pitch changes when the spooling system was about to start
a print job.  I used to astound people by pointing at the line printer
a second or two before the print job started.

-Paul W.

  reply	other threads:[~2023-02-10 21:09 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-10  0:37 [COFF] Music! Mike Markowski
2023-02-10  1:19 ` [COFF] Music! segaloco via COFF
2023-02-10  1:43 ` Dave Horsfall
2023-02-10  6:35 ` Lars Brinkhoff
2023-02-10 15:23   ` Paul Winalski
2023-02-10 19:13     ` Lars Brinkhoff
2023-02-10 19:05 ` Bakul Shah
2023-02-10 21:09   ` Paul Winalski [this message]
2023-02-11  2:53   ` steve jenkin
2023-02-11  4:20     ` Dave Horsfall
2023-02-11 19:24       ` Harald Arnesen
2023-02-11 16:40     ` Mike Markowski

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