HP 98568A Installation Instruction page 176

HP 98644A Asynchronous Serial Interface
98644A interface, then you can skip to step 3. The select code
is preset to 9 and need not be changed.
a. Find the group of switches labeled SWI by referring to Figure 5-3l.
Switches 6 thru
10
in this group determine the select code.
b. Set these switches to one of the five select codes given in Figure 5-32,
unless you have used them elsewhere (check the Select Code Record on
the Chapter 5, "Interface Cards" tab to see which ones you have used).
Refer to the installation note that came with the interface if you need
additional switch settings.
Select Code 10 Select Code 1 5
Select Code 16 Select Code 1 7
Select Code 1 9
Figure 5-32.
3. Set the Interrupt Level.
5-80 Adding Interface Cards