I have an RS/6000 box that runs AIX. A few years ago I reinstalled AIX on it using an external CD-ROM drive over a serial console. One of the Microchannel cards in it has the Power1 Chipset. It also has Microchannel SCSI and various other I/O cards on it. It's not joke hardware running OS/2 with an x86 processor. It's the real thing, not a run-to-proprietary-becuz-we-had-to PC clone.
It's totally different from IBM shoveling their 'IBM PC' business onto proprietary hardware and x86 on a microchannel buss design. They did that with the 'PC' to run away from the ISA buss which they had lost control of. They could have gone EISA, they could have done any number of other things. They chose to run off onto a proprietary path because they were afraid of the competition.