That same Open Firmware Forth system [1], which was developed by Mitch Bradley [2], was not only in the PowerPC Mac bios, but it was originally used for the SparcStation boot roms, and eventually in the OLPC, and it was even an IEEE Standard 1275-1994!

[1] https://en.wikipedia.org/wiki/Open_Firmware

[2] https://en.wikipedia.org/wiki/Mitch_Bradley

In fact: the Open Firmware boot loader and plug-in card firmware interface technology, commonly used by both Sun and Apple, is the only firmware standard in existence to ♫ have its own theme song ♫ [3] !!!

[3] https://web.archive.org/web/20070204145613/http://playground...

    : OpenFirmwareSong ( 🎸- ♬ )
        \ By Mitch Bradley.
        \ Sung to the tune of "The Flintstones".
        𝄞
        ." Firmware" cr
        ." Open Firmware" cr
        ." It's the appropriate technology," cr
        ." Features" cr
        ." FCode booting" cr
        ." Hierarchical DevInfo tree." cr
        ." Hack Forth" cr
        ." Using Emacs on the keys," cr
        ." Save in" cr
        ." NVRAM if you please." cr
        𝄒 cr
        ." With your" cr
        ." Open Firmware" cr
        ." You can fix the bugs in no time" cr
        ." Bring the kernel up in no time" cr
        ." We'll have an FCode time!" cr
        𝄒 cr
        \ Thank you and good night!
        reboot
    ;