AVMIS

#include <iostream.h>
#include <conio.h>
#include <dos.h>

void PrintBinary(int);


class Speaker{

public:
    static void On()
    {
        int portState = 0x0;
        portState = inp(0x61);
        portState |= 0x03;
        outp( 0x61, portState);
    }
    static void Off()
    {
        int portState = inp(0x61);
        portState &= 0xFC;
        outp( 0x61, portState );
    }
    static void Beep( unsigned int frequence, int duration)
    {
        Speaker::SetFrequence(frequence);
        delay(duration);
    }
    static void ReadStates()
    {
        outp(0x43, 0xE2); // 11 1 0 001 0
        cout << "\n0x40 ";
        PrintBinary((int)inp(0x40));
        outp(0x43, 0xE4); // 11 1 0 010 0
        cout <<  "\n0x41 ";
        PrintBinary((int)inp(0x41));
        outp( 0x43, 0xE8); // 11 1 0 100 0
        cout << "\n0x42 ";
        PrintBinary((int)inp(0x42));
    }
private:
    static void SetFrequence( unsigned int freq)
    {
        int result = 0;
        if ( freq <= 0 ) return;
        const long TimerClock = 1193180;
        int val = 0;
        val = TimerClock / freq;
        outp( 0x43, 0xB6);
        result = val % 256;
        outp( 0x42, result);
        result = val / 256;
        outp( 0x42, result);
    }
};


void PrintBinary( int decimal )
{
    int copy = decimal;
    int i = 0;
    short array[20] = {0};
    for( ; copy != 0; ++i )
    {
        array[i] = copy % 2;
        copy /= 2;
    }
    i = 7;
    while ( i >= 0)
    {
        cout << array[i--];
    }
}

void main()
{
    clrscr();
    // ----------------
    Speaker::On();
    Speaker::Beep(1193, 500);
    Speaker::ReadStates();
    Speaker::Off();
    // ----------------
}