IBM F80 Service Manual page 30

6 Key
The numeric 6 key works like the numeric 5 key, except that firmware uses the
customized service mode bootlist that was set up using the AIX service aids.
8 Key
To enter the open firmware command line, press the numeric 8 key after the word
keyboard displays and before the last word (speaker) displays during startup. After you
press the 8 key, the remaining POST indicators display until initialization completes.
When initialization and POST are complete, the open firmware command line (an OK
prompt) displays.
The open firmware command line should only be used by service personnel to obtain
additional debug information.
To exit from the open firmware command prompt, type reset-all or power off the
system and reboot.
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Service Guide