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  Description:  Device Open      [AT] [PS/2]
 
  Acquires ownership of a logical device for a process.
 
  Input                    Output
  ═════════════            ════════════════════════
  AH=80H                   If function successful
  BX=device ID             Carry flag=clear
  CX=process ID            AH=00H
                           If function unsuccessful
                           Carry flag=set
                           AH=status
                                    -♦-