INT 7C - SK-UPPS Data Link Interface API - GET PROTOCOL STATUS
        AX = 000Ch
        BX = protocol ID (see AX=000Bh)
        ES:DI -> Protocol Status Block (see below)
Return: AX = completion code (see AX=0001h)
SeeAlso: AX=000Bh,AX=0014h

Format of Protocol Status Block (PSB):
Offset  Size    Description
 00h    DWORD   -> ASCIZ protocol name
 04h    WORD    protocol mode (see AX=0007h)
 06h    WORD    protocol type (see AX=0007h)
 08h    WORD    number of registered multicasts (see AX=0009h, AX=0014h)

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