Compaq Armada 1500 User Manual page 52

8. Insert the new memory board at a 45 degree angle and gently
slide it into place until it is correctly seated.
The memory board is keyed (notched) slightly off
NOTE:
center to help you position it correctly.
9. Rotate the memory board down until it snaps into place.
Installing the Memory Board
Removable Drives & Upgrades 5-9