IBM tried to make a more thoroughly "IBM" proprietary PC product first with the PCjr and then especially with the PS/2. Attempted to lock down the hardware a bit more, introduced the Microchannel bus/architecture, etc.

But it was too late, and they didn't have the power they thought they had.

They nerfed the PCjr with a horrid keyboard to keep the office people from buying it. This is a shame, as it had better color graphics, and we had to wait for XGA (or Tandy 1000) to get better color.