Compaq 500B Microtower Supplementary Manual page 13

3 Position the memory module over the socket, aligning
the notch with the tab in the socket, and then firmly
press the module down into the socket.
...until the retaining clips at the ends of the socket lock
the module into place.
4 Set the computer upright.
537490-001 — Removing and Replacing Memory
5 The side panel has several tabs on its top, bottom,
and leading edges.
6 The tabs fit into slots and over the front lip of the
computer.
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