These early models had two distinct generations. The first generation uses the PowerPC 601 and 603 processors and used the old NuBus/PDS expansion slots, while the second generation uses the faster 603e, 604 and 604e chips as well as industry-standard PCI expansion slots. The second generation also makes use of Open Firmware, allowing them to more easily boot alternate operating systems (including OS X via XPostFacto), though use of various hacks was still necessary.
These early models had two distinct generations The first generation uses the PowerPC 601 and 603 processors and used the old NuBus/PDS expansion slots, while the second generation uses the faster 603e, 604 and 604e chips as well as industry-standard PCI expansion slots. The second generation also makes use of Open Firmware, allowing them to more easily boot alternate operating systems (including OS X via XPostFacto), though use of various hacks was still necessary.