HP LaserJet 9000 Printer series - Manual (Page 211)

B Control panel menus 211
Configure device menu
Parallel input submenu
Item Values Explanation
HIGH SPEED YES
NO Accepts faster parallel communications used for connections with newer
computers.
ADVANCED
FUNCTIONS=ON ON
OFF Turn the bidirectional parallel communication on or off. The default is set for a
bidirectional parallel por t (IEEE-1284).
This setting allows the product to send status readback messages to the
computer. (Turning the parallel advanced functions on might slow language
switching.)