Pismo 400; had X 10.2.6 on the internal and 9.2.2 on an external firewire. Was firmware-up-to-date as of a week ago.

Bought and swapped in a 500 mhz processor.

Firmware suddenly needed updating again, and couldn't be done from the external (never could shut down and restart command-option and get it to run, it'd make the long tone indicating it recognized the key command then fail).

Had to install 9.2.2 on the internal drive AND remove 10.2.6 and reinstall back to 10.2.0, then it ran the firmware update fine.

Then had to cmd-opt-p-r; cmd-opt-O-F, reset-all, reset-nvram (three times) and run preferences and bindings first from the CD-installer, then from the internal X drive, then from another external firewire drive, before it would boot and be stable again.

So, with the Pismo, I"m guessing the firmware is on the processor board, not the motherboard? Or, whatever.

The more I learn about computers, the more I miss CP/M-86.