HP 98568A Installation Instruction page 167

HP 98642A 4-Channel Multiplexer Interface
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Select Code 10 Select Code 1 5
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Select Code 16 Select Code 17
Select Code 19
Figure 5-30.
3. Set the Interrupt Level.
SKIP?
The interface is preset to interrupt level 3. Unless you
are certain that interrupt level 3 is inappropriate for your
application, leave the interrupt level setting alone and skip to
step 4.
a. Find the group of eight switches on the interface by referring to
Figure 5-29. Switches 2 and 3 in this group determine the interrupt level.
b. Set the interrupt level to the desired value by referring to Table 5-15:
Adding Interface Cards 5-71