Gates had a version of DOS ready in 6 weeks, while DR was still planning DOS. MS got things going much faster.
> DR was still planning DOS
No, DR was planning CP/M-86.
I feel like I'm going down this thread posting corrections, but when trying to thrash out the details, I think it's vital to get the details right.
DR was about 3Y late with CP/M-86. The 8086 shipped in 1979, IIRC -- I was only 12 -- and there was no CP/M yet. The IBM PC shipped in 1981. Still no CP/M.
Tim Paterson, author of QDOS, went on record as saying he'd never have bothered if CP/M-86 had actually shipped.
No. He ran out and acquired 86-DOS, from Seattle Computer Products. It's easy to have something when you buy it already complete.
And DR had CP/M-86.