Compaq 100 Series Manual page 64

Installing a Memory Expansion Board
All memory expansion boards are asymmetrically keyed (notched) to
ensure correct positioning. Memory expansion boards can be used in
either memory expansion slot.
1. Insert the memory expansion board into an empty memory expansion
slot at a 45-degree angle
2. Push the memory expansion board down
in the plastic retention clips.
Figure 5-14. Installing a Memory Expansion Board
5-16 Removal and Replacement Procedures
(Figure 5-14).
until the board is seated