OpenFirmware was also the firmware (~BIOS) for the One Laptop Per Child XO. The software was open sourced for OLPC and is online here: https://www.openfirmware.

OpenFirmware was also the firmware (~BIOS) for the One Laptop Per Child XO. The software was open sourced for OLPC and is online here: https://www.openfirmware.info/Open_Firmware https://www.openfirmware.info/Open_Firmware. This is the same code that was developed at Sun and evolved for Mitch Bradley's projects ever since. (I _think_ that Apple wrote their own interface-compatible implementation mostly in C.) For OpenFirmware is one of the best programs in existence. See also the OLPC Forth Lessons wiki: http://wiki.laptop.org/go/Forth_Lessons http://wiki.laptop.org/go/Forth_Lessons