Date: Mon, 08 Nov 2004 11:19:05 -0800 From: "Kevin Oberman" <oberman@es.net> To: Paul Richards <paul@originative.co.uk> Cc: Max Laier <max@love2party.net> Subject: Re: cvs commit: src/sys/kern subr_param.c Message-ID: <20041108191905.4D47B5D04@ptavv.es.net> In-Reply-To: Your message of "Mon, 08 Nov 2004 18:50:33 GMT." <20041108185033.GB34058@myrddin.originative.co.uk>
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> 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. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634
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