I've taken to calling my Power Macintosh G4/466 the Debian Mac. I continue to be amazed at how well Debian Etch runs on this thing with 466 MHz of PowerPC CPU and a smallish 128 MB of RAM.
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The best thing I could do for the usability of this box is to up the RAM. It'd be nice to have 512 MB of RAM in here. The box will take up to 1.5 GB, but I have yet to find any PC-133 RAM sticks in my possession that will work.