Apple iMac G3 (Original) - Manual (Page 5)

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To increase the memory to the maximum of 256 MB, install a 128 MB DIMM in the
user-accessible upper expansion slot. Have a 128 MB DIMM installed in the lower slot. To
maintain your Apple warranty, the DIMM in the lower slot must be installed or removed by an
Apple-authorized service provider.
For more information about the type of SO-DIMMs you must use, see the technical
specifications in your online information, About Your iMac, available via the Help Center in the
Help menu.
Video Memory Configurations
Your computer comes with a total of 6 MB of Synchronous Graphic RAM (SGRAM) video
memory; 2 MB are built into the logic board and 4 MB are in the video memory slot.
About the Backup Battery
If you have intermittent problems starting up your computer and the date is reset, you need to
replace the lithium backup battery in the computer. Replacing the battery may cause some
settings on your computer, such as the desktop patterns, to revert to the factory default
settings. You may also have to restore modem settings in any communication programs you
are using.
Installing Memory or Replacing the Battery
Follow these instructions to install additional memory or replace the backup battery.
Installing additional memory and replacing the backup battery involves four procedures:
m Turning off the computer
m Opening the computer
m Inserting the memory module into a specific slot or replacing the battery
m Closing the computer
Important
This computer uses Synchronous Dynamic Random-Access Memory (SDRAM)
SO-DIMMs. DIMMs from older Macintosh computers are not compatible with your computer
and should not be used even though they may fit into the RAM DIMM slots.
Important Make a note of the settings before you replace the battery.
Important Before installing any of these items, carefully read “About Memory” on page 4 and
“About the Backup Battery,” above.