HP 98568A Installation Instruction page 185

SKIP?
HP 98562-66530 Human (System) Interface Board
If you also have an SRM interface installed in your computer
(at select code 21), you must change the select code of the
LAN interface to an unused value; continue with this step.
Otherwise, skip to step 7. The select code is preset to 21 and
need not be changed.
a. Find the group of eight switches labeled "LAN". The five switches
labeled "M" (for Most-significant bit) and "SELECT CODE" in this
group are the LAN Select Code switches (see Figure 5-33).
b. Set the LAN Select Code switches to one of the four select codes given
in Figure 5-34, unless you have used them elsewhere.
Select Code 23 Select Code 24 Select Code 26
Select Code 30'
Figure 5-34.
7. Set the LAN Interrupt Level.
SKIP?
The LAN interface is preset to interrupt level 5, the setting
required by HP-UX. Unless you are certain that interrupt level
5 is inappropriate for your application, leave the interrupt level
setting alone and skip to step 8.
a. Find the group of eight switches labeled "LAN". The two switches
labeled "INT" and "LEV" in this group are the LAN Interrupt Level
switches (see Figure 5-33).
b. Set the LAN Interrupt Level switches according to Table 5-20:
Adding Interface Cards 5-89