Int 2F Fn D110  - Mdebug Command Driver - Get Address Of The Old Int 2f    [G]

   AX = D110h

Return: DL = FFh
   ES:BX -> next program in the chain for INT 2F
   CX = code segment of this driver
   DI = offset of driver identification table (see below) (v1.60+)

Notes: only called by the transient part of the driver
   must be reentrant and the driver must not chain this function to the
     old INT 2F

Format of the driver identification table:
Offset Size    Description
 00h  26 BYTEs  signature "Kommandotreiber f.r MDEBUG"

                        - Note: ASCII 129,German U-umlaut
 27h  12 BYTEs  name of driver, e.g. "MDHISDRV.COM"
        each driver must have a unique name