It seems like, at the very least, an OpenFirmware hack could be devised that would at least allow the fans to run more slowly, but a more flexible approach would be to somehow write an extension and/or control panel that would exert the same kind of control over the fans as OS X's AppleFan.kext, which would probably be ideal. With all these workarounds, I've noticed that nobody has even considered an attempt at duplicating OS X's control mechanism in an OS 9 environment. I have observed (both first hand and anecdotally) that this is a very common problem with MDD G4s under OS 9, and that people have come up with solutions like replacing the fans with quieter versions (probably not a terrible idea *anyway*), downgrading from a dual to a single CPU card, and, the most obvious, running Mac OS X exclusively (and using Classic if running Mac OS X =< 10.4.11) and using the CHUD tools.
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