IBM also failed to lock down the IBM PC hardware standard. They tried, with the PS/2 and the Micro Channel Architecture, but it turns out clone makers were more

IBM also failed to lock down the IBM PC hardware standard. They tried, with the PS/2 and the Micro Channel Architecture, but it turns out clone makers were more interested in standardizing and improving the existing non-standard (retconned into being the Industry Standard Architecture, ISA) into EISA than in signing on to perpetually license MCA from IBM. https://en.wikipedia.org/wiki/Micro_Channel_architecture https://en.wikipedia.org/wiki/Micro_Channel_architecture