Developer Documentation
PATHHardware Documentation > Original Power Mac G3 Computers Developer Note


Sound Output

All of the sound output features for Power Macintosh G3 computers are provided by the Apple DVD-Video and Audio/Video Card, Audio Input/Output Card, or Audio/Video Input/Output Card. The Audio Input/Output Card provides one mini jack for sound output on the back of the enclosure. The DVD-Video and Audio/Video Card and Audio/Video Input/Output Card each provide three sound output connectors, two RCA jacks for right and left sound out, and one 3.5-mm mini jack for a stereophonic phone plug. The All-in-one model has an additional pair of 3.5-mm mini jacks for headphones on the front of the enclosure.

The output jacks are connected to the sound amplifier; the mini jacks are intended for connecting a pair of headphones or amplified external speakers. Inserting a plug into the sound output mini jack disconnects the internal speaker. The modular desktop and tower enclosures have one built-in speaker. All-in-one enclosures have a pair of front-firing stereo speakers and sound output jacks at the front and rear. In the all-in-one enclosure, the internal speakers are turned off when the rear jack is used for external speakers.

The Screamer IC provides the stereo sound output to both the internal speakers and the sound output jacks in configuration with the Apple Audio/Video and Apple Audio input/output cards. The Burgundy IC provides the stereo sound output to both the internal speakers and the sound output jacks in configurations with the Apple DVD-Video and Audio/Video Card.


© 1998 Apple Computer, Inc. - Revised 8/13/98