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  Description:  Enable/Disable Pointing Device      [PS/2]
 
  Enables or disables the system's mouse or other pointing device.
 
  Input                             Output
  ══════════════════════            ═══════════════════════════════
  AH=C2H                            If function successful
  AL=00H                            Carry flag=clear
  BH=enable/disable flag            AH=00H
     00H=disable                    If function unsuccessful
     01H=enable                     Carry flag=set
                                    AH=status
                                       01H if invalid function call
                                       02H if invalid input
                                       03H if interface error
                                       04H if resend
                                       05H if no far call installed
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