The LaserWriter IINT does have a serial (DB-25) RS-232/RS-422 port that can be used with PC's. However, it is tricky getting anything to print out using any newer PC OS's (Win95/98, etc) because it was origionally designed with dos drivers in mind (the IINT was introduced in '88). I had a IINT that I could print out simple text files from my Linux box/dos computer, but you also run into problems with the IINT's amout of built in memory (2MB).
You might try looking for info in the Apple TIL files, and I know Adobe has some PC drivers avilable on it's web site for Apple Postscript printers compatable with PC's.
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-Eliott Wolfe