Description: . Take over the INT 9 replace voice terminal services application program 2. Exit and the presence of memory, waiting for interrupt 3. When the interrupt occurs (eg, keyboard), the new interrupt service routine Music. 4. Checking whether a key is ALT+ F6, or ALT+ F7, if not directly call the original interrupt service routine processing INT9 If the ALT+ F6, you call the speaker sound, and finally call the original interrupt service routine processing INT9 If the ALT+ F7 , calls the draw on the screen is cleared, and then drawing [yellow rectangle], calling the original INT9 interrupt service procedures.
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int9source.txt
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