🚀 go-pugleaf

Right, dug out my old copy of PC intern for you.

void HardBeep(int Freq, int Duration)
{
    OSVERSIONINFO osInfo;
    osInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);

    GetVersionEx(&osInfo);

    if( osInfo.dwMajorVersion >= 5 ||
        osInfo.dwPlatformId == VER_PLATFORM_WIN32_NT )
    {
        Beep(Freq,Duration);
        return;
    }
    asm {
        mov eax,1193181
        xor edx,edx
        mov ebx,dword ptr [Freq]
        div ebx
        pushd eax
        mov al,182
        out 0x43,al
        pop eax
        out 0x42,al
        mov al,ah
        out 0x42,al
        in al,0x61
        or al,3
        out 0x61,al
    }
    Sleep(Duration);
    asm {
        in al,0x61
        and al,0xfc
        out 0x61,al
    }
}

The above function basically does the Beep command under Win9x as it does 
for NT and above. On an NT based system it simply calls the Beep command. If 
under any NT system this produces a beep on the sound card, then its because 
your sound card drivers are intercepting commands to the internal speaker in 
an attempt to be helpful.

I've tested the above on WinXP and Win98 with an audigy sound card and the 
sound card was never used.