Sony PCG-VX88 - Manual (Page 91)

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Adding Memory
In the future you may want to install memory modules to expand the
functionality of your computer. See the Specifications sheet supplied with
your computer for the amount of preinstalled memory. Expansion memory
modules are available as options. For memory upgrades and information
about which memory modules to use, refer to the Specifications sheet.
This section provides you with information on removing and replacing a
memory module:
❑ Precautions and Procedures
❑ Removing and Installing a Memory Module
❑ Confirming Added Memory Capacity