HP 98568A Installation Instruction page 182

HP 98562-66530 Human (System) Interface Board
Installation Procedure
HPI
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OPTION CARD
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Figure 5-33.
Human (System) Interface board switches
1.
Play It Safe.
a. Turn your computer off and unplug the power cord.
b. Remove the Human (System) Interface board from the back of your
computer by loosening the two thumb screws and pulling on the handle.
Be careful to handle the card only by its edges and metal end plate, as
the card may be easily damaged by electrostatic discharge (static zap).
5-86 Adding Interface Cards