Opening this iMac is complicated. Seems I had to disassemble half the computer to get to the HD-carrier. Don't even think about doing this without the take-apart manual!
Partitioned the HD in three; one for OS9, one big scratch (for PhotoShop and future DVD-burning) and the rest for OSX.
A tip for anyone else who needs to do this. You have to use the firmware updater 4.1.9 before installing OSX. To do this, you must boot from an OS9 disk, not a CD. BUT: the updater checks all your RAM, and any DIMM not up to Apples specs is DISABLED and becomes invisible to the system (because OSX is more particular about RAM than OS9 cared to be - god knows how many OS9 crashes were caused by almost-good RAM!)
I found a wonderful little application that checks the quality of your RAM before doing the firmware upgrade, "DIMM First Aid".
I am positively surprised about the speed of OSX on this elderly Mac. Even all the animations of OSX (the genie minimizing etc) runs smoothly - smoother in fact than on two G4 AGPs I have also upgraded; maybe because of the video-cards? Contrary to many postings on this list, it seems to me that OSX (10.3 in my cases) runs FASTER than OS9 did. Might be thanks to the multi-threading, that gives you back control of the Mac before the last command is finished.
This iMac has 320 megs RAM. Maybe all the people complaining about OSX' sluggishness simply had to little RAM?
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