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Helpful answers
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Mar 23, 2015 8:13 AM in response to lottavonanoby Niel,That iMac's maximum OS is 10.4.11.
(124671)
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Mar 23, 2015 8:20 AM in response to lottavonanoby Allan Jones,If it does not already have a version of Mac OS 10.2 or higher installed, it will require a firmware update before updating, something that Apple has inconveniently deleted from their download sites.
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Mar 23, 2015 8:49 AM in response to Allan Jonesby lottavonano,and then how do I upgrade the firmware?
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Mar 23, 2015 12:01 PM in response to lottavonanoby rccharles,Cross your finger and hope the machine already has the correct firmware install. I could have a copy of the firmware. Let me know if you want me to search around.
Figuring out what level of Open Firmware you have?
1) Mac OS 9.x or 8.x, you need to use the Apple System Profiler.
Apple -> Apple System Profiler
2) Mac OS X, use the System Profiler.
Apple -> About This Mac
click on the More Info... tab
click on Hardware
read the Boot ROM Version
3) Open Firmware, boot into Open Firmware.
Power on your iMac while holding down command+option+o+f
The first output line contains the firmware level. Mine reads:
Apple PowerMac4,1 4.1.9f1 BootRom built on 09/14/01 at 13.18.04
Copyright 1994-2001 Apple Computer Inc.
On my machine, I have 4.1.9f1.
What firmware do you need?
http://support.apple.com/kb/HT1395
You can download the firmware from this page:
http://support.apple.com/kb/DL1283
filename: N-iMac_FWUpdate_4.1.9.smi.bin
avoid expanding the file on the download computer.
For a slot loading iMac, this article indicates that you need to be running 9.1 or later version of Mac OS Classic.
http://support.apple.com/kb/DL1283
"The iMac Firmware Update 4.1.9 will only run on iMac computers with slot-loading CD or DVD drives running Mac OS 9.1 or later from a local drive. If you are using Mac OS X you must boot from a local Mac OS 9.1 or later writeable partition (not a CD, or network disk) prior to following the update instructions."
You can download the Mac OS 9 updates from the Apple site.
http://support.apple.com/kb/HT1387?viewlocale=en_US
For tiger, you need 256meg of memory. A slot loader will take 1gig of memory.
You may need to get more memory.
get the 512meg card(s)
http://eshop.macsales.com/shop/apple/memory/iMac/G3_450MHz_500MHz_600MHz_700MHz
Mac OS X 10.4: System requirements
http://support.apple.com/kb/HT1514
PPC 10.4.11 combo update.
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Mar 23, 2015 2:55 PM in response to rccharlesby Allan Jones,Thanks rrchales!
Lst time I tried to download that link it took me to Apple's main download page like happens when they revoved software. There must have been enough interest to restore it.
However, the link to the OS9 upgrade you posted no longer works.
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Mar 23, 2015 3:05 PM in response to Allan Jonesby rccharles,I have copies of the 9.x stuff. Post a note if you need it. I'll then check my email. The 9.x page loads, but the download links do not.
They moved it. Somebody found it & I made a note of it.