104 Chapter 5 What’s Under the Hood
FireWire devices
The computer can provide up to 28 W total to the FireWire ports.
System Clock and Battery
Your computer has CMOS custom circuitry with a long-life battery.
Battery
Use a 3-volt, BR 2032 Lithium coin cell replacement battery (see “Replacing the Internal
Backup Battery” on page 74).
Dimensions and Operating Environment
Dimensions
 Weight: 39.9 lbs. (18.1 kg)
The weight depends on the configuration. The weight above is for a basic
configuration and may be greater if optional devices are installed.
 Height: 20.1 inches (51.1 cm)
 Width: 8.1 inches (20.6 cm)
 Depth: 18.7 inches (47.5 cm)
Operating environment
 Operating temperature: 50° to 95° F (10° to 35° C)
 Storage temperature: –40° to 116° F (–40° to 47° C)
 Relative humidity: 5% to 95% (noncondensing)
 Maximum altitude: 10,000 feet (3048 meters)
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