NetBSD/sys/arch/i386/isa/spkr_reg.h

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/*
* PIT port addresses and speaker control values
*
* $Id: spkr_reg.h,v 1.2 1993/08/02 17:52:36 mycroft Exp $
*/
#define PITAUX_PORT 0x61 /* port of Programmable Peripheral Interface */
#define PIT_ENABLETMR2 0x01 /* Enable timer/counter 2 */
#define PIT_SPKRDATA 0x02 /* Direct to speaker */
#define PIT_SPKR (PIT_ENABLETMR2|PIT_SPKRDATA)