Model: HP LaserJet 4
Operating System: DOS (Note: might work with other versions of this os.)
1. Turn on printer and make sure it is online.
2. If you are in Windows, exit to the DOS prompt.
3. Change to the directory that you have unzipped this file to.
4. Type LJ4SETUP to run the program.
I have also uploaded a disk called DOS Drivers that goes with this. I called the file HP4DOS.ZIP