INT 14 - MX5 Extended FOSSIL - GET MNP STATUS BLOCK
        AX = E000h
        DX = port number (0-3)
Return: ES:BX -> status block (see below)
Program: MX5 is a FOSSIL driver by MagicSoft which emulates MNP Level 5, and
          ships with the MTEZ terminal program as MTEMNP.DRV (a TSR despite
          the .DRV extension)
SeeAlso: AX=E006h

Format of status block:
Offset  Size    Description
 00h    BYTE    flag: active (00h no, 01h yes)
 01h    BYTE    MNP level (2,4,5)
 02h    BYTE    series ID from remote MNP
 03h    DWORD   total packets transmitted
 07h    DWORD   duplicate packets transmitted
 0Bh    DWORD   maximum speed
 0Fh    DWORD   total packets received
 13h    DWORD   duplicate packets received
 17h    DWORD   maximum speed

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