Open Firmware
From Mac Guides
Open Firmware is the hardware/software combination used to boot PowerPC based Macintosh computers and manage the hardware connected to the computer. Open Firmware requires no user intervention and is therefore "invisible" to the end user.
On the PC this is accomplished by the BIOS or EFI (Extensible Firmware Interface).
Open Firmware is not used on Macintosh computers based on Intel processors. EFI takes its place.
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