From: Paul Winalski <paul.winalski@gmail.com>
To: Bakul Shah <bakul@iitbombay.org>
Cc: coff@tuhs.org
Subject: [COFF] Re: Music!
Date: Fri, 10 Feb 2023 16:09:15 -0500 [thread overview]
Message-ID: <CABH=_VTf83Z7YkZHngoB57a1mULeh+2HTMC5Cz=Nr9BYQEq+LQ@mail.gmail.com> (raw)
In-Reply-To: <98FF7DD9-2CA4-4347-85B9-5D8B99395712@iitbombay.org>
On 2/10/23, Bakul Shah <bakul@iitbombay.org> 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.
next prev parent 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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