The following week, Apple clarified Snow Leopard would be Intel only. At an early stage in Snow Leopard’s development, continued OS X support for PowerPC Macs was still on the table. Apple withheld comment on the UB nature of this DP, designated Build 10A96 (with a Darwin 10.0.0d1 kernel). When Apple supplied a first Developer Preview (DP) of OS X 10.6 Snow Leopard at WWDC in June 2008, its operating code prioritized Intel hardware but included a working kernel, Finder, and Universal Binary (UB) code for PowerPC Macs.
OS X 10.5 Leopard, on sale October 2007, would be the last major version retailed for PowerPC Macs. During Apple’s product transition from PowerPC to Intel Macs, OS X supported both architectures, but a phase-out of PowerPC support neared.
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