We have an ancient 800mhz G4 ibook that is still quite useful as it is only 12" in size and is fairly light as the internal cd/dvd drive died and was removed. However, it cannot run any os later than 10.4 because the install program checks the cpu speed and if it is less than 867Mhz the program will not work.
However, there is a workaround, basically fake the cpu speed by reporting it to the OS as 900mhz.
First we goto http://www.macupdate.com/app/mac/26562/leopardassist and download the leopard assist program. This sets up the trick and restarts the machine.
We hook up an external firewire drive and boot the install DVD from that. Click install and away we go...
and after a few minutes it is complete. So how does 10.5 run on an 800mhz G4 with 1.25mb of ram? not bad, i wouldn't run garageband on it but it does well as a web surfer and email machine.
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I did something similar to get Photoshop CS2 on our old clunky desktop, but in reverse. I edited the installer to have lower system requirements so it would install successfully. It's a little slow to start the program but it works just fine.
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