Apple Desktop Computer manual Main RAM Expansion Modules, Video RAM Expansion Modules

C H A P T E R 1

Introduction

Main RAM Expansion Modules

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. ▲

Video RAM Expansion Modules

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. ▲

USB Ports and Devices

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).

Compatibility Issues 19