- open the Mac that is to act as an external hard drive. Jumper the SCSI ID to 1 (or whatever, just not 0 or 7). On many Macs (especially LCs), this can be done by just unclipping the drive and swinging it up to access the ID pins - no need to unscrew anything, or even unplug the cables.- connect the two computers using a 25 way to 25 way SCSI cable.
- Power on the "external hard drive" Mac and press the programmer's interrupt button during the RAM test (the gray checkerboard screen before the Mac "smiles")
- This Mac then "crashes" prior to its SCSI controller being initialised on SCSI ID 7 and is to all intents and purposes an external SCSI disk.
- Boot the other Mac and tranfer data across.
