HP 98568A Installation Instruction page 42

HP 98577 A VMEbus Expander
1~~.
Pick the Expander up and turn it right-side-up, holding it by the front and
rear panels.
Figure 2-16.
Lifting the Expander
14. Lower the Expander onto the computer, making sure that it is lined up
front-to-back with your fingers and side-to-side visually.
Figure 2-17.
Aligning the Expander and Computer
2-18 Adding Expanders