Network prt problem/AutoCad HP 230

I have a client that has the following setup: 4 Win95 Pc’s 1 WinXp Pc. AutoCad 14.0 with a HP plotter DesignJet 230 on one of the Win95 PC’s via the LPT port. All the PC’s can print (CAD) and have been printing to the 230 via network printing. The XP PC was just added and can print a Windows test page to the 230 but cannot plot any drawings. Any help is MUCH appreciated.