New World ROM
New World ROM Macintoshes are the Macintosh models that do not use a Macintosh Toolbox ROM, but instead use an Open Firmware boot ROM. All Macs from the iMac forward are New World ROM machines, while all previous models (including all beige and platinum Macs) are Old World ROM machines.
When booting Classic Mac OS, these models load the Toolbox ROM from a file on the boot volume into RAM. In Mac OS X, the Toolbox ROM file is not used.
New World ROM Macs can boot Mac OS X directly, since Open Firmware allows precise designation of the startup files. Non-Mac operating systems, such as BSD variants and Linux can also boot directly using the same mechanism.
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