Sony PCG-812 - Manual (Page 128)

VAIO Notebook Computer User Guide
If the addihonal memory is rrot shown, repeat steps 1-9.
To remove a memory module
1 Shut down your computer and disconnect all peripheral devices.
2 Unplug your computer and remove the battery packs.
3 Turn your computer upside down and open the cover on the bottom.
4 Touch a metal object (such as the connector panel on the back of your
computer) to discharge static electricity.
3 Remove the memory module.
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6 Close the cover.