Close. Usenet for the tiebreaker:
> At the ">" ROM debugger prompt, type the following lines, pressing Return after each:
> SM 0 A9F4
> G 0
> In the first line, the "SM" stands for "Set Memory", the "0" signifies memory location "0", and the "A9F4" is the trap number for the "ExitToShell" trap. This line puts "A9F4" at memory location "0". In the second line, the "G" stands for "Go" and the "0" stands for memory location "0". This line tells the computer to execute the instructions starting at memory location "0". Since "A9F4" is at memory location "0", the "ExitToShell" trap is executed.
https://groups.google.com/g/comp.sys.mac.system/c/lM8yT3I3P0...