Apple iMac - Manual (Page 19)

C H A P T E R 1
Introduction
Compatibility Issues 19
Main RAM Expansion Modules 1
For expansion of main RAM, the iMac computer uses standard SO-DIMMs that
contain SDRAM devices. These are similar to the SO-DIMMs used in the
Macintosh G3 PowerBook Series. For more information, see “Main RAM
Expansion” (page 48).
IMPORTANT
The main RAM DIMMs in the iMac must be SO-DIMMs
that use SDRAM devices. SO-DIMMs that use EDO or
SGRAM devices will not work.
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Video RAM Expansion Modules 1
For expansion of video RAM, the iMac computer accepts one standard
SO-DIMM that contains SGRAM devices. This is the same as the video
expansion SO-DIMMs used in the the Power Macintosh G3 computers. For
more information, see “Video RAM Expansion” (page 53).
IMPORTANT
The video RAM DIMMs in the iMac must be SO-DIMMs
that use SGRAM devices. SO-DIMMs that use EDO or
SDRAM devices will not work.
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USB Ports and Devices 1
The USB ports take the place of the ADB and serial I/O ports found on earlier
Macintosh computers. Software shims have been added to allow existing
applications designed to work with ADB mice and keyboards to work with the
equivalent USB devices. See “USB Compatibility Issues” (page 30).