HP 98568A Installation Instruction page 200

HP 98724A/98725A Local Graphics Bus Interface
If you have two Graphics Display Stations, only one of them
may be set to internal addressing mode, so you should follow
the directions in step 2 when installing the second LGB card.
a. Find the set of six switches labeled "SWl" on the HP 98724A/25A
interface card (see Figure 5-40 and Figure 5-41). The switch labeled
"FB" determines the Frame Buffer address, and the other five switches
labeled "CS" (for Control Space) determine the interface's select code.
b. To use the Graphics Display Station as a graphics output device only,
you need to set the switches to an external addressing mode. Set these
switches to one of the three select codes given in Figure 5-42, unless you
have used them elsewhere. Refer to the installation note that came with
the interface if you need additional switch settings.
Select Code 26-27 Select Code 28-29 Select Code 30-31
Figure 5-42.
3. Insert the LGB Interface Card.
a. Insert the HP 98724A/25A, component side up, into an empty I/O slot
in your computer. Tighten the thumb screws on the metal end plate until
the end plate is flush with the back of the computer.
b. If you have other interface or accessory cards to install, leave the cover
plates off; otherwise replace them.
4. Record the Select Code.
If you set the select code in step 2, record it on the "Select Code Record"
form on the Chapter 5, "Interface Cards" tab so that you will know in
the future that it has been used and is no longer available. If you did not
change the switches from their original settings, you need not worry about a
select code, since the internal code for the system console is used.
5-104 Adding Interface Cards