HP 98568A Installation Instruction page 44

HP 98577 A VMEbus Expander
19. Install the computer top cover on the Expander. Start the front edge first,
at a 45° angle.
Figure 2-19.
Installing the Cover
20. Press the cover down, then slide it forward. Make sure that the bottom,
rear corners of the top are seated in their retaining clips.
Figure 2-20.
Seating the Cover
2-20 Adding Expanders