From owner-cvs-src@FreeBSD.ORG Mon Nov 8 20:05:56 2004 Return-Path: Delivered-To: cvs-src@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8B38F16A4F9; Mon, 8 Nov 2004 20:05:55 +0000 (GMT) Received: from www.cryptography.com (li-22.members.linode.com [64.5.53.22]) by mx1.FreeBSD.org (Postfix) with ESMTP id 32A0C43D39; Mon, 8 Nov 2004 20:05:55 +0000 (GMT) (envelope-from nate@root.org) Received: from [10.0.0.34] (adsl-67-119-74-222.dsl.sntc01.pacbell.net [67.119.74.222]) by www.cryptography.com (8.12.8/8.12.8) with ESMTP id iA8K5fFp010720 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Mon, 8 Nov 2004 12:05:42 -0800 Message-ID: <418FCFD3.6030101@root.org> Date: Mon, 08 Nov 2004 11:58:11 -0800 From: Nate Lawson User-Agent: Mozilla Thunderbird 0.9 (Windows/20041103) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Kevin Oberman References: <20041108191905.4D47B5D04@ptavv.es.net> In-Reply-To: <20041108191905.4D47B5D04@ptavv.es.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit cc: src-committers@freebsd.org cc: cvs-src@freebsd.org cc: cvs-all@freebsd.org cc: Poul-Henning Kamp cc: Kris Kennaway cc: Max Laier cc: Paul Richards Subject: Re: cvs commit: src/sys/kern subr_param.c X-BeenThere: cvs-src@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 Nov 2004 20:05:56 -0000 Kevin Oberman wrote: >>Date: Mon, 8 Nov 2004 18:50:33 +0000 >>From: Paul Richards >>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