HP LaserJet 3100 All-in-One Printer series - Manual (Page 266)

EN C Changing Parallel Port Modes 265
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1. While your computer is booting, follow the directions on the screen:
“Press F2 to Enter Setup.” (It may be F1 on some models.)
2. Click Advanced on the Menu Bar.
3. Follow the legend directions to choose Integrated Peripherals (or
Peripheral Configuration on some models).
4. Choose ECP if it is a choice for the mode. Otherwise choose
Bi-directional. (ECP mode will provide the best printing and
scanning performance.)
5. Follow the legend directions to save and exit.
General information
Within computer manufacturers’ range of products, there are usually
different BIOS options. The directions given above for various
manufacturers are general and may not be specific for your
computer. Changing the parallel port mode is similar for all computers
if they have that capability built in. However, you should refer to your
computer documentation for specific instructions on changing the
parallel mode for your computer. A circumstance to be aware of is
that even though the label on the parallel port mode may say ECP, it
may not follow the protocol. If the port mode option you choose does
not work, then try another option in the Setup. If your computer does
not have EPC capability built in, an external parallel port card can be
added to give it this functionality.