Use the following procedure to restore the HP-4500 to its original factory settings:
1. Make sure there is not a floppy disk in the drive. (If you perform a factory reset with a floppy disc in the drive, you risk losing the data on the disk.)
2. Hold the LOAD and SAVE buttons, press WRITE. "FACTORY SET UP LOADED" will be displayed.
NOTE: During step 2, "DISK NOT READY PRESS>EXIT" will be shown momentarily in the display. This is normal and will not affect the reset procedure.