There are versions of NT4 Workstation and Server, and NT 3.51 Server that run on PPC chips. If memory serves, you are limited to the 601, 603, and 603e chips. Note: You CANNOT INSTALL WINDOWS ON A Mac even with the PPC editions. They were created to run on 3rd party machines by HP and IBM. Then two evils (Intel & M$) decided to prevent non x86 systems from growing, so the multi-platform NT was discarded. BTW: NT4 also had/has versions for MIPS, SPARC, x86, and PPC. I even have a CD with (I think) all 4 versions.
TEG