Int 60 Fn 01  - Mdebug - Get Address Of The Help Registers                 [G]

   AH = 01h
   DS:SI -> password or a null byte

Return: AX = return code
       FFFEh password is invalid
       FFFDh display mode is invalid
       else successful
       ES:DI point to the help registers of MDEBUG
          ES:DI-02h  -> R0 (WORD)
          ES:DI      -> R1 (WORD)
          ES:DI+02h  -> R2 (WORD)
          ES:DI+04h  -> R3 (WORD)
          ...
          ES:DI+0Eh  -> R8 (WORD)