The Open Firmware reference article from the English Wikipedia on 24-Apr-2004
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Open Firmware

Sponsorship the way you would do it
Open Firmware is a hardware-independent firmware (computer software which loads the operating system), developed by Sun Microsystems, and used in modern Apple Macintosh computers, Sun Microsystems SPARC based workstations and servers, and PegasosPPC systems, among others.

It is accessed by a user by a FORTH-based language interface.

It is described by IEEE standard IEEE-1275.

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