Start up old Mac while pressing and holding down the T key
until the FireWire
icon
appears
Connect your old Mac to the new one with FireWire
cable.
An icon of your old Mac just as if it was an external hard drive should appear on the
desktop.
Copy data across same way as you do from an external hard
drive.
- Apple calls it 'FireWire target
disk mode':
You can even transfer data from dead (not booting up) Mac to
PC this way.
It works with almost all Macs made after year 2000.