A G4 450DP running OS9.1 after a clean system install boots directly into open firmware with the message
"open, unknown word
DEFAULT CATCH! code=300 at %SSR0 : ff80b070
%SRR1 : 00003030"
then lists the bootROM build details followed by
"Welcome to Open Firmware.
To continue booting type "mac-boot and return"
but no response from keyboard.