"unimplemented trap"

Hello from Japan, i am new to Linux for PPC, and before the SuSE installation can proceed on my 7300/166, ther eis this little problem here that needs to be solved: at startup the BootX Extension causes an "unimplemented trap" error. The machine is running System 7.6.1 (and i have already tried booting with all unneeded extensions removed, without success). Do i need to use a different OS to start the installer from? Thanks & regards: Hendrik --