216 SPARCstation 20 Service Manual • July 1996
Audio Ports
The audio ports include: headphone connector, microphone connector, audio line-in
connector, and audio line-out connector.
TABLE C-8 lists the pin assignments and
signal descriptions for the audio ports.
FIGURE C-8 Back Panel Audio Ports and Icons
5 Comp Sync O GND Composite sync
6 Hort Sync O TTL Horizontal sync
7 Serial Write O TTL Serial write
8 Sense <1> I TTL Sense
9 Sense <2> I TTL Sense
10 Ground None GND Ground
TABLE C-8 Audio Port Signals
Headphone Microphone (old) Microphone (new) Line-Out Line-In
Tip Left Channel Mono In Left Channel Left Channel Left Channel
Ring
(Center)
Right Channel Microphone power Right Channel Right Channel Right Channel
Shield Return Ground Return Return Return
TABLE C-7 13W3 Connector Pin Assignments
Pin Function I/O Level Signal Description
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