Int 2F Fn D100  C - Mdebug Command Driver - Get Status                     [G]

   AX = D100h
   BX = version of MDEBUG (BH = major, BL = minor)
   CX = command driver counter
---v1.60+---
   DS:SI -> MDEBUG identification table (see below)
   ES = segment of display memory used by MDEBUG
   DI = size of video mode used by MDEBUG
       (high byte = lines, low byte = columns)

Return: DL = FFh
   BX = version number of the driver if it is less than the version in BX,
        else unchanged
   CX incremented
Program: MDEBUG is a shareware memory-resident debugging tool by Bernd
     Schemmer, including a memory monitor, an interpreter, and a
     disassembler

Notes: called by MDEBUG at start of popup session; if the version number
     returned in BX is less than 1.52 (1.60 for MDEBUG v1.70), MDEBUG will
     not call any of the other functions during this popup session
   MDEBUG can use any two consecutive multiplex numbers between C0h and
     FFh; the default is D0h for the display driver and D1h for the
     command driver (see INT 60/AH=00h"MDEBUG" for the multiplex numbers
     actually used)
   this function must end with a far call to the old INT 2F handler after
     changing the registers
   this function MUST be reentrant
   command drivers must also declare the following data at the given
     offsets in the code segment
       100h  3 BYTEs   JMP-command in .COM-files
       103h    BYTE    NOP-command (90h)
       104h 26 BYTEs   signature "Kommandotreiber f.r MDEBUG"
       11Eh 12 BYTEs   name of driver, e.g. "MDHISDRV.COM"
               each driver must have a unique name
   MDEBUG will pass every key and command to the command driver(s) before
     checking for a valid internal command

See Also: AX=D000h,AX=D101h

Format of MDEBUG identification table:
Offset Size    Description
 -2    WORD    entry offset
 00h   WORD    CS of MDEBUG
 02h   DWORD   old INT 08h vector
 06h   DWORD   old INT 09h vector
 0Ah   DWORD   address INT 16h routine used by MDEBUG
 0Eh   BYTE    length of version string
 0Fh  N BYTEs  version string