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Solved!

Laser Jet 4 JetDirect card

HP Recommended
Example: PavilionLaserJet 4 65XX
macOS 10.14 Mojave

Would like to add a network server card, JetDirect card, to an old fully functional LaserJet 4 printer that currently does not have network capability.  Anyone know which card(s) would be appropriate for this printer.  Info not on HP site.  Thx.

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You're quite right East2100, thanks for catching that. What I get for answering when tired.

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No, What @ALS-77  said was not right!  Sorry about that.

Any one of HP JetDirect card J2552A,  J2556A, J4106A, J4100A,  J2550 will do.

Find one from eBay it should be cheap.

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thx

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Companies like Startech and TP Link also make a network adapter that connects to the parallel port of the LJ4. 

If you find the information provided useful or solves your problems, help other users find the solution easier by giving kudos and marking my post as an accepted solution.
I am a volunteer, offering my knowledge to support fellow users, I do not work for HP nor speak for HP.

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