Int 14 Fn 4001  - I1541 - Test If 1541 Cable Connected                     [t]

   AX = 4001h

Return: CF clear if connected
       BL = LPT number where 1541 cable is connected (1..3)
   CF set if cable not connected
Desc:  scan all the LPT ports searching for the adapter cable

See Also: AX=4000h