@geit
@Andreas_Wolf
-Thanks for clarifying the cost and hardware.

-I did a fresh install of OSX Leopard and then MorphOS for duel booting. Working great. A bit more testing and at this rate I'm going to take the plunge for my PowerBook G4.

Don't want to deviate from the subject but...

@redrumloa
Maybe a $35 RPi2 (ARM Cortex-A7 quad-core). Here are some benchmarks Power Mac G4 (Mirrored Drive Doors) w/ 2 CPUs vs iPad3,2 A7 dual-core.
http://browser.primatelabs.com/geekbench2/compare/583223/583189

Also just noticed a paid version of AROS (AEROS) for the Raspberry Pi. Who knows how stable.