The "IBM PC" was a category of machines, not a model. Many of which had advanced processors with MMUs and 16-bit support: https://en.m.wikipedia.org/wiki/List_

The "IBM PC" was a category of machines, not a model. Many of which had advanced processors with MMUs and 16-bit support: https://en.m.wikipedia.org/wiki/List_of_IBM_Personal_Computer_models https://en.m.wikipedia.org/wiki/List_of_IBM_Personal_Compute... If what you're referring to as the "IBM PC" is the classic model 5150 and we follow your arbitrary designation of a "real OS", than no. But, by that same logic, I can say ducks aren't birds "if we consider birds only those with non-webbed feet".