Apple Workgroup Server 9150 - Manual (Page 21)

Specifications I/O Devices - 9
I/O Devices
Keyboard
Standard, extended, or adjustable keyboard
Keyboard draws 25–80 mA, depending on model of keyboard
Mouse
ADB Mouse II; Draws up to 10 mA
Microphone
Electret, omnidirectional; output voltage is 4 mV, peak to peak,
at normal value; does not use Apple PlainTalk microphone