Quote from kkmfg on 06/12/07 at 09:26:51:Yeah, it was already written... And it was called CP/M. They bought the rights to the source code and then modified from there.
MS didn't even port it, they took it over after it was ported for use with the IBM 8086/88 processor by the maker of the 8086 board. The original clone of C/PM was QDOS. I don't think Digital Research (DR, the C/PM people) got anything out of the deal, either. MS took over QDOS, from which was born both MS-DOS and PC-DOS (the IBM version). DR did a much better job of converting C/PM later and called that DR-DOS. There were a number of legal hassles between MS and DR, and MS came out on top, even though DR-DOS was the better operating system.
Okay, enough strolling down memory lane. Sorry for the detour.