Int 16 Fn AF80  - K3plus V6.00+ (api V2.00+) - Get Original Int 09h Vecto  [K]

   AX = AF80h
   BX = 4B33h ('K3')

Return: AL = status
       00h not supported
       81h if successful
       ES:CX -> original INT 09 handler

See Also: AX=AF4Dh,AX=AF50h,AX=AF81h,AX=AF82h