Apple Workgroup Server 9150/120 - Manual (Page 66)

Connecting a trackball or other input device
Your server has an Apple Desktop Bus (ADB) port, which you use to connect
the mouse, the keyboard, and other input devices such as a trackball, a bar-code
reader, or a graphics tablet.
You can usually connect up to three ADB devices in a chain to a single port. The
exact number depends on how much power the devices require.
IMPORTANT The total power used by all ADB devices connected to your
server must not exceed 500 milliamperes (mA). Information about the power
requirements of the mouse and keyboard are in the Technical Information
booklet that came with your server. Check the information that came with
your other ADB device for power requirements.
Connecting a microphone
Your server has a sound input port, which you can use to connect a microphone.
IMPORTANT The Workgroup Server 9150 is not designed for use with
speech recognition programs—do not use the Apple PlainTalk Microphone
with this server.
ADB port icon
ADB port
50 Chapter 3 / Expanding Your Server and Connecting Other Equipment