There was a widespread belief that it needed a PS/2 and MCA, but it didn't.
I ran it on Librex laptops and several generic clones. No version ever _needed_ MCA.
It's just one of many things that doomed it. :-(
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Might have been the case, but on my small town buying such IBM model was the only way to get OS/2.
No one was selling it on OEM clones, and buying a PC clone was already expensive enough, to even think about trying to get an additional alternative OS at IBM prices.