I appreciate everyones feedback.  I checked out a local computer shop this afternoon and found an untested HP Laserjet 4M+.  I am doubtful that the printer works, but I picked it up for $10 and it has the JetDirect card.

So besides installing the JetDirect in the 4+ I have that I know that works, what else will I need to remove and install?

Will I need to install any drivers or software on the Quadra 650?

Thanks again.