December 4, 1992: Apple engineers demonstrate a “proof of concept” of the Mac operating system running on an Intel computer. More than a decade before Macs will switch to Intel processors, getting Mac OS to run on PCs is an astonishing feat.
It’s part of an aborted plan to make Apple’s software available on other manufacturers’ hardware. Apple ultimately chickens out, fearing (probably correctly) that such a move would hurt Macintosh sales.