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  Interrupt:   09h
 
  Title:       Keyboard I/O
 
  See also:    Keyboard Interrupts, Key Scan Chart,
               Extended Key Codes, Keyboard Data Memory
 
  Description:                                            [PC] [AT] [PS/2]
 
     Invoked when a key is pressed or released while the interrupt
     enable flag is set. BIOS routine reads the key scan code sent from
     the keyboard and places in the circular keyboard buffer a word
     containing the key's scan and ASCII codes. Applications request
     keyboard input through DOS or BIOS services that read the next
     scan/ASCII word pair from the buffer.
 
     This interrupt should not be called directly. To trap Int 09h
     calls, a program must set up a handler routine to gain control
     when the interrupt occurs.
 
     Input     Output
 
     None      None
                                    -♦-