Subversion Repositories Shiroi

/* $Id: psg.c 8 2024-08-28 16:29:15Z nishi $ */

#include "psg.h"

#include "io.h"

short psg_addr;
short psg_data;

void beep(void){
        _beep(3L * 1024);
}

void _beep(unsigned long howlong){
        if(psg_addr == -1) return;
        unsigned long i;

        outp(psg_addr, 8);
        outp(psg_data, 0x0f);

        outp(psg_addr, 0);
        outp(psg_data, 0xd6);

        outp(psg_addr, 1);
        outp(psg_data, 0x0);

        outp(psg_addr, 7);
        outp(psg_data, 0x3e);

        for(i = 0; i < howlong; i++);

        outp(psg_addr, 7);
        outp(psg_data, 0x3f);
}

void psg_card(int t, int port){
        if(t == 0x11){
                psg_addr = port - 2;
                psg_data = port - 1;
        }
}