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At that time was he talking about 68k or Intel Mac?

I had a Power Mac.

This is from 1997, so PowerPPC + System 7 or w/e, not OS X

Possibly https://en.wikipedia.org/wiki/A/UX but then again probably not.

A/UX was never mainstream and nobody called it MacOS. Carmack was definitely talking about MacOS 7/8/9 in this context.