HP Compaq NC6220 Hardware And Software Manual page 120

9. Insert the new memory module:
a. Align the tabbed (notched) edge 1 of the module with the
b. With the module at a 45-degree angle from the surface of
Hardware and Software Guide
tabbed area in the memory slot.
the memory compartment, press the module into the
memory slot until it is seated 2.
Memory Modules
8–4