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by cable2600·5y ago·view on hn ↗
Microsoft coped the DRI CP/M model. Sell the OS to PC Makers and make it a standard.

IBM used off the shelf parts for the IBM PC, so others were able to copy it easily. When IBM made the PS/2 series with Microchannel it was supposed to be a clone killer.

Ironic that IBM does not make PCs anymore, and sold that IP to Lenovo.

1 comments
You forgot the BIOS part, had Compaq not been able to stand in court, the clones would have been dead right there.
The interesting thing about the BIOS is that IBM published the (fully commented) source code for it in the Technical Reference Manual.
Well, IBM needed some sort of a business model…