Using old laserjets on new computers

I have a collection of LaserJet 5p laser printers.

I bought one of them new, for about $900, in 1994 or 1995.  The others I have acquired for very little in the interim twenty years, along with a collection of toner cartridges.

My trusty XP computer died recently, and I decided to give up XP.  I  bought a new HP computer, which runs Win 8.  New computers don't come with a parallel port, indeed my new computer does not have even a way to add a parallel port.

I also acquired a Win 7 computer, with a parallel port.

I'll be discussing how to get a LJ5P running on both.

Comments and experienced regarding using old laserjets are more than welcome.