INT 7C - SK-UPPS Data Link Interface API - GET DRIVER VERSION
        AX = 0000h
Return: AH = major DLI version
        AL = minor DLI version
        DX = OEM signature (see below)
        CL = DLI 2.8+ topology: 1=Ethernet, 2=FDDI, 3=Token-Ring
SeeAlso: AX=0002h,AX=000Bh,AX=000Dh,AX=000Eh

OEM signatures (defined by SK):
 0001h experimental
 3343h 3COM
 4942h IBM
 4943h Intellicom
 494Eh Intel
 4B4Fh Kodiak
 4D41h Madge
 4E45h Novell
 4F43h Olicom
 5349h Siemens
 534Bh Schneider & Koch (SysKonnect)
 5744h Western Digital

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