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MacPro/new iMac are the first systems with 64-bit kernel
One of the advantages of the IBM PowerPC 970 (used in the G5s and iMac G5) is that it switch between executing 32-bit and 64-bit executables, on the fly. This capability made it very simple for Apple to support 64-bit applications, as xnu (the kernel) only needed minor changes, and more importantly, xnu and all the kexts could remain 32-bit. So the barrier to entry was quite low, to support 64-bit |
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