I used a hacked bootloader written in Forth to boot OS9 on an Apple machine that wasn't meant to run it. Some Forth wizard wrote it for Apple service techs to use in the period of time when many machines they sold could run both--but this machine had an artificially imposed restriction preventing consumers from running OS9 normally. All of the original Apple PPC boot ROMs (
http://en.wikipedia.org/wiki/Open_Firmware) were written in Forth, you can even drop into a Forth ``shell'' at boot instead of loading the OS.
I could have just bought another older machine that was ``supposed'' to boot OS9 but I had to prove this smarmy ``Genius'' in an Apple products IRC channel wrong when he told me it was impossible to do.
I only use it to play games. The whole system locks up quite often though it's worth the $50 I paid for it to play old games written in the 68k days. Also, After Dark. OSX got it all wrong.
Thanks for reading my blog post.