Thank you for LeopardAssist! It let me install Leopard on my 400-MHz Power Mac G4 (Digital Audio).
There is a small problem. My Power Mac has two hard drives each with three partitions. Apparently the partition on which LeopardAssist created boot.txt is not the partition on which OpenFirmware was looking for it, because when LeopardAssist rebooted my Mac, OpenFirmware said it could not find hd:/boot.txt (or something like that). I don't know which partition it wanted it on, but I worked around it by copying boot.txt to the root of every partition and rerunning LeopardAssist.
Resolved in v2.0 onward. Boot.txt no longer required by Open Firmware when LeopardAssist is run.
Last edit: iMac600 2014-01-29