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The PowerPC was a joint effort from the AIM consortium — Apple, IBM and Motorola — which resulted from the three companies pooling their efforts in an attempt to stem Intel's desktop tsunami.
Introduced in 1992, the PowerPC created a burst of interest — OS/2, Windows NT and Solaris all had PowerPC versions — which died away quickly, as nobody bothered to move x86 applications over to the new platform.
Apple stuck to the architecture until 2004, when it capitulated and moved to Intel, and PowerPC left the desktop. It's still in IBM mainframes and, as is entirely predictable, embedded applications.
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