These files are needed in order to set up and configure the LaserJet 4.
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