[Àû¿ë´ë»ó: DOSBox-x]

PC speaker PIT timer is programmed to this frequency on startup.

If the DOS game or demo causes a long audible beep at startup (leaving the gate open) try setting
this option to 0 to silence the PC speaker until reprogrammed by the demo.

Set to 0 for some early Abaddon demos including "Torso" and "Cycling".
