Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758020AbXFMK1R (ORCPT ); Wed, 13 Jun 2007 06:27:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756951AbXFMK1I (ORCPT ); Wed, 13 Jun 2007 06:27:08 -0400 Received: from pollux.ds.pg.gda.pl ([153.19.208.7]:3481 "EHLO pollux.ds.pg.gda.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756701AbXFMK1G (ORCPT ); Wed, 13 Jun 2007 06:27:06 -0400 Date: Wed, 13 Jun 2007 11:27:03 +0100 (BST) From: "Maciej W. Rozycki" To: Jan Engelhardt cc: David Schwartz , "Linux-Kernel@Vger. Kernel. Org" Subject: RE: PC speaker In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1050 Lines: 22 On Tue, 12 Jun 2007, Jan Engelhardt wrote: > >4) It assumes the current will be sufficient to burn out the speaker. (I > >know it will get very hot on older machines, whether it will burn out -- > >might even depend on the exact speaker model.) > > Since you can set the x86's crystals frequency from 1193182 to 18 Hz > (PIT_TICK_RATE / 1 to PIT_TICK_RATE / 65535) [*], you can never really > bust it. But even then, what would a speaker do it was constanly given I am fairly sure you have a choice between a steady low and a steady high level on the speaker output available if you switch the 8254 to the right single-shot mode. In case you have not been into such details -- the 8254 offers six modes of operation, selected for each channel separately, of which only two are periodic. Maciej - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/