linux-kernel - RE: PC speaker

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Message-ID: <Pine.LNX.4.64N.0706131119010.7198@blysk.ds.pg.gda.pl>
Date:	Wed, 13 Jun 2007 11:27:03 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
cc:	David Schwartz <davids@...master.com>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: RE: PC speaker

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
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