Int E0 Fn 002D  - Pcrobots V1.41 - "register_x" - Select Automatic X Posi  [g]

   AX = 002Dh
   BX:CX -> X word variable

Return: AX = status (0001h OK, 0000h problem with address)

Note:  after this call, PCROBOTS will automatically update the specified
     word whenever the robot moves

See Also: AX=002Eh