)
Values for SK-UPPS Data Link Interface OEM signature (defined by SK):
 0001h		experimental
 3343h	('3C')	3COM
 4942h	('IB')	IBM
 4943h	('IC')	Intellicom
 494Eh	('IN')	Intel
 4B4Fh	('KO')	Kodiak
 4D41h	('MA')	Madge
 4E45h	('NE')	Novell
 4F43h	('OC')	Olicom
 5349h	('SI')	Siemens
 534Bh	('SK')	Schneider & Koch (SysKonnect)
 5744h	('WD')	Western Digital