Sony PCG-SRX87 - Manual (Page 85)

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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 flyer supplied with
your computer for the amount of memory preinstalled on your computer.
Expansion memory modules are available as options. For memory
upgrades, use only unbuffered PC100 (CL2) SDRAM µDIMM modules.
(Sony offers the optional 128 MB PCGA-MM128T memory module.)
This section provides you with information on removing and replacing a
memory module:
❑ Precautions and Procedures
❑ Removing a Memory Module
❑ Installing a Memory Module
❑ Confirming Added Memory Capacity