Technical information

Power requirements for devices you can connect
Apple Desktop Bus (ADB)
m Trackpad draws up to 10 mA
m Keyboard draws 25–80 mA (varies with keyboard model used)
m Maximum current available for all ADB devices and all serial devices: 500 mA
Note: The ADB port can support up to three daisy-chained ADB devices.
Audio and telecommunications devices
The following table shows power allowances for external devices connected to input ports.
Device Voltage Current Power
Microphone +5 V 1 mA 5 mW
GeoPort Telecom Adapter & ADB devices +5 V 500 mA 2.5 W
S-video input connector +12 V 250 mA 3 W
Technical
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