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One option at boot time is to put the computer into a mode of operation called Target Disk mode. This mode is similar to SCSI Disk mode on a PowerBook computer equipped with a SCSI port, except it uses a FireWire connection instead of a special SCSI cable.
When the PowerBook computer is in Target Disk mode and connected to another Macintosh computer by a FireWire cable, the PowerBook computer operates like a FireWire mass storage device with the SBP-2 (Serial Bus Protocol) standard. Target Disk mode has two primary uses:
The PowerBook computer can operate in Target Disk Mode as long as the other computer has FireWire 2.3 or newer.
To put the computer into Target Disk mode, the user holds down the T key while the computer is starting up. When Open Firmware detects the T key during the boot process, it transfers control to special Open Firmware code.
To take the computer out of Target Disk mode, the user presses the power button.
For more information about Target Disk mode, see the section "Target Mode" in Technote 1189, The Monster Disk Driver Technote. The technote is available on the Technote website at
http://developer.apple.com/technotes/