386 w/UNIX jumper??

I have gotten hold of 5 working (and very attractive as well durable) Intel model PSYP3022254DOX machines with 386DX-25 processors and two case fans in each, one behind the front plate (to cool cards I guess) and the other in the normal AT style power supply. As usual, no docs. This is not a problem as most is self explanatory. There is one jumper on the mainboard though that goes in either 1-2 or 2-3 that's marked "Unix", nothing else. Anyone have any idea what this would do? I've moved it but nothing,but I haven't loaded Unix on it either. -------------------------------------------------------------------- Russ Blakeman RB Custom Services / Rt. 1 Box 62E / Harned, KY USA 40144 Phone: (502) 756-1749 Data/Fax:(502) 756-6991 Email: rhblake(a)bbtel.com or rhblake(a)bigfoot.com Website: http://members.tripod.com/~RHBLAKE/ ICQ UIN #1714857 AOL Instant Messenger "RHBLAKEMAN" * Parts/Service/Upgrades and more for MOST Computers* --------------------------------------------------------------------