/*
 * speaker.c -- device driver for console speaker on 80386
 *
 * v1.0 by Eric S. Raymond (esr@snark.thyrsus.com) June 1990
 * hacks for 386bsd by Andrew A. Chernov <ache@astral.msk.su>
 * fixes for SVr4 by Wolfgang Denk <wd@pcsbst.pcs.de>
 *
 * The speaker.c code is copyright 1994 by Eric S. Raymond
 * <esr@snark.thyrsus.com>.  Use it as you like, as long as you include this
 * notice in any derived works and explain how you derived them from speaker.c
 * somewhere.
 *
 *	$Id: speaker.c,v 1.10 1994/10/24 22:35:06 esr Exp $
 *
 * Portability requirements:
 *    Needs SVr3.2-compatible copyin(), inb(), outb(), timeout(), sleep(),
 * spl5(), splx(), and wakeup().
 */