I managed some time ago to get a iMac G3 Rev. B machine from my neighbor, who was simply going to junk the machine. I thought that was a horrid idea, so I took it off their hands.
After getting the machine, deciding what to do with it was a little tricky. It's more than a decade old. It has less than 2.5% 2010-era RAM. It's processor runs about 1.25% the speed of a modern processor. And I don't mean processor clock speed. Let me explain this:
The iMac processor is a 233MHz PowerPC 750 (a G3). This processor is about 10% the computational throughput of a 2.8GHz Pentium 4 HT (before "HyperThreading technology" was initialized as HTT). Same P4 chip is about 10% the computational throughput of a modern Core i7 processor, ergo, the iMac is 1/100th the speed of today's machines
The machine, when I got it, only had one upgrade from stock. It had an additional 32MB RAM card installed, which I replaced with a 256MB PC133 card. too bad only 128MB is detected, leading to a current usable total of 160MB. The machine is meant for PC66 RAM, which may explain the partial RAM incompatibility.
Now, I tried to install Mac OS X 10.1 a few months ago. As I had lost my Diablo II CDs, I instead gave Blizzard my CD-Key to enable digital downloads for that title. After downloading the D2 netinstall for Mac, I was prompted by the Installer to run 10.2. Ok, no big deal.
Wait a few months, decide to try again, and now I find out that Blizzard updated their netinstalls for their digital downloads. Now, the bare minimum is 10.3.9 (as their installer depends on libstdc++.6.dylib). The games themselves likely have much lower requirements, but the installer went from minimum of 10.2 to 10.3.9 in just a few months.
According to this article on Low End Mac, I should stick to Mac OS X 10.2.8 (what I have now). But this means no Blizzard games! I can easily pirate the game .iso discs, but I want to try to do this 100% legal.
Currently, I'm burning Mac OS X 10.3 CDs, and in a little while, I'll upgrade to 10.3.9, and see if the Blizzard Downloader will work then.