One of my favorite MacOS tools is partially broke. Choosing your start-up partition by holding down the option key during start-up hangs if my SCSI Jazz 2g has power. All the bootable partitions appear, then the spinning disk spins until the coffee is gone, bills paid, and the dog walked. Turning off the drive lets the utility function as intended. This occurs which ever of my 9.1 systems were used last.
1-OS-Xpb (build h39)