Intel SG-81 - Manual (Page 24)

2-14 Chapter 2
2.3.12. External I/O Panel
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Mouse: PS/2 mouse connector.
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Keyboard: PS/2 keyboard connector.
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LPT1: Parallel port connector.
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COM1: Serial port connector.
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VGA1: Monitor signal connector.
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USB1/USB2: USB 2.0 connectors.
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LAN1:10/100Mbps LAN connectors.
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AUDIO:
Mic In: Connects to the plug from external microphone.
Line In: Connects to the line out from external audio sources.
Line Out: Connects to the front left and front right channel in the 5.1-channel
or regular 2-channel audio system.
SG-80 Series