Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Keyboard Interrupt
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     The BIOS Int 09h routine maintains the shift status word at memory
     address 0:417h. Bits of this word indicate status of shift keys
     such as SHIFT, ALT, CTRL, and CAPS LOCK. The routine also
 
        ■ Invokes Int 05h if it detects a SHIFT+PRINT SCREEN
          combination or PRINT SCREEN key
        ■ Invokes Int 1Bh if it detects a CTRL+BREAK combination
        ■ Beeps the speaker if the keyboard buffer is full
                                    -♦-