HP 98568A Installation Instruction page 194

HP 98548/49/50A High Resolution Video Boards
a. Turn the monitor OFF and disconnect the existing monitor and video
cables (if any).
b. Remove the existing video board or empty slot cover plate from the
bottom wide slot on the back of the computer (see Figure 5-38). You
may need a Pozidriv screwdriver to loosen it.
The new Video Board goes here.
Figure 5-38.
Video Board Placement
4. Complete the Installation Procedure
a. Set the video board's eight configuration switches as shown in
Figure 5-39.
5-98 Adding Interface Cards