What is Old World ROM?

Old World ROM computers are the Macintosh models that use a Macintosh Toolbox read-only memory chip, usually in a socket. All Macs prior to the iMac, the iBook, the Blue and White Power Mac G3 and the Bronze Keyboard PowerBook G3 use Old World ROM, while said models, as well as all subsequent models until the introduction of the Intel-based EFI Models, are New World ROM machines. In particular, the Beige Power Mac G3 and all other beige and platinum-colored Power Macs are Old World ROM machines. In common use, the "Old World" designation usually applies to the early generations of PCI-based "beige" Power Macs , but not the older Motorola 68000-based Macs; however, the Toolbox runs the same way on all three types of machines.