Hello,
Your best bet, although it might cost a couple $$, is to get a jet direct for the LaserJet 4, (either internal or external), and have your Mac talk to it through the ethernet port. You can assign the jet direct an IP number, or an AppleTalk name, and printing will work just fine with the standard drivers.
I have not known of any way to wire a parallel printer to a Macintosh, and have it work nicely with postscript (you do have a postscript card in the LJ4, right? Otherwise I think you might need another add-in, possibly DAVE, in order to use HPGL. Macintosh and Unix/Linux are built around postscript printing).
I bet you could go to a second-hand computer store and find an internal jet direct for the LJ 4 for an inexpensive price. New external jet directs are $150 or so. The laserjet 4 was released around the time of 10baseT networks, so if you have to get an ethernet hub, make sure it can do 10 Mbs.
My setup here at home is a LaserJet 4MP with 2 paper trays, and it works fine with OS X 10.2 or better. It is on an internal jet direct, and I print via IP from the Mac and the Linux box, and the Windows box....
Let us know,
Christian
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