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18 nishi 1 
/* $Id: sound.c 18 2024-08-29 06:56:23Z nishi $ */
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#include "sound.h"
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#include "../io.h"
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short psg_addr;
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short psg_data;
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void beep(void){
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	_beep(1L * 1024 / 2);
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}
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void _beep(unsigned long howlong){
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	if(psg_addr == -1) return;
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	unsigned long i;
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	outp(psg_addr, 8);
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	outp(psg_data, 0x0f);
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	outp(psg_addr, 0);
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	outp(psg_data, 0xb0);
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	outp(psg_addr, 1);
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	outp(psg_data, 0x0);
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	outp(psg_addr, 7);
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	outp(psg_data, 0x3e);
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	for(i = 0; i < howlong; i++);
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	outp(psg_addr, 7);
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	outp(psg_data, 0x3f);
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}
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void sound_card(int t, int port){
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	if(t == 0x11){
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		psg_addr = port - 2;
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		psg_data = port - 1;
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	}
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}