HP Compaq NC6110 Hardware And Software Manual page 141

Hardware Components
13. Insert the new memory module into the memory module slot:
a. Align the keyed (notched) edge of the memory module 1
b. With the memory module at a 45-degree angle from
5–30
with the keyed area in the memory module slot.
the surface of the memory module compartment, press the
module into the memory slot until it is seated 2.
Hardware and Software Guide