@failedLyndonLaRouchite It's a bit overly simplistic but yeah they paid something less than $100K entirely for the rights and hired the 86-DOS main developer, Tim Paterson, of 86-DOS to get it up to where it needed to be to become PC-DOS. MS-DOS 1.x was very rough but had lots of improvements over 86-DOS. IIRC MS-DOS 2.x was essentially a ground up rewrite though.