A sound warning circuit for pci hot-plug

PURPOSE: An alarm system for a PCI hot plug is provided to prevent a PCI hot plug from being proceeded by operating a speaker in case that a user accesses an adaptor card unequipped with the PCI hot plug by mistake, thereby giving the alarm. CONSTITUTION: A timer 2 inputs a clock of 1.19318MHz, a bit 0 of a system port B for controlling a system. An AND gate inputs an output of the timer 1 and a bit 1 of the system port B. A speaker driver inputs an output of the AND gate. A speaker is driven by the speaker driver. In case that the bit 0 of the system port B is set as '1', the timer divides clocks by the number n programmed by a user. In case that the bit 1 is set as '1', a signal is transmitted to the speaker driver through the AND gate. In addition, the signal is amplified and a sound is generated through the speaker.