Date: Mon, 08 Nov 2004 11:58:11 -0800 From: Nate Lawson <nate@root.org> To: Kevin Oberman <oberman@es.net> Cc: Paul Richards <paul@originative.co.uk> Subject: Re: cvs commit: src/sys/kern subr_param.c Message-ID: <418FCFD3.6030101@root.org> In-Reply-To: <20041108191905.4D47B5D04@ptavv.es.net> References: <20041108191905.4D47B5D04@ptavv.es.net>
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Kevin Oberman wrote: >>Date: Mon, 8 Nov 2004 18:50:33 +0000 >>From: Paul Richards <paul@originative.co.uk> >>Sender: owner-cvs-all@freebsd.org >> >>On Sat, Nov 06, 2004 at 04:03:12PM -0800, Kris Kennaway wrote: >> >>>On Sat, Nov 06, 2004 at 03:50:06PM -0800, Nate Lawson wrote: >>> >>> >>>>I was traveling out of the country so I didn't get a chance to comment. >>>> The two caveats I'm aware of is a slight loss in processes that are >>>>CPU bound and an audio hum from ACPI CPU idling. The latter is rather >>>>interesting actually. At hz=100, it's just a quiet low buzz but at >>>>1000, it is readily audible on many laptops and annoying. Windows uses >>>>hz=1000 too and has the same problem. I believe it's related to the >>>>capacitors and other devices charging/discharging when clocks are stopped. >>> >>>Can we play music by modulating the value of hz? :) >> >>I remember some code for the Commodore Pets that you could use to play >>notes on a nearby radio by tweaking some spinning loops. Quite a neat >>trick at the time since there wasn't any sound hardware. > > > Actually, this technique predates the PET by any years. I know that we > could play music on the PDP-1 and that goes back to the late '05s or > early 60's. I did it on my PDP-11 in the early '70s. I also heard a CDC > MASStore tape system played as an organ by adjusting the tape movement > in the vacuum columns. Ok, this is way off-topic but here's what you can do with a printer flash mod to play print head, carriage return, and error beeper: http://www.qotile.net/audio/printer1.mp3 http://www.qotile.net/audio/printer2.mp3 http://www.qotile.net/audio/printer3.mp3 -- Nate
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