Acer TravelMate 4000 - Manual (Page 53)

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Upgrade options
Your computer delivers superior power and performance. However,
some users and the applications they use may demand more. This
computer allows you to upgrade key components when you need
increased performance.
Note: Contact your authorized dealer if you decide to perform a
key component upgrade.
Memory upgrade
Memory is expandable to 2 GB, employing DDR 266/333 256MB/512MB/
1GB SDRAM modules. The computer supports shadow RAM.
There are two memory slots on your computer. Upgrade memory by
inserting a higher capacity DIMM into one or both of these slots.
Installing memory
Follow these steps to install memory:
1 Turn off the computer, unplug the AC adapter (if connected) and
remove the battery pack. Then turn the computer over to access its
base.
2 Remove the screw from the memory cover (1), then lift up and
remove the memory cover (2).