On Thu, Apr 15, 2021 at 11:04 AM Liam Proven <lpro...@gmail.com> wrote: >[..] > Ha! Drive letters most definitely did _not_ start with DOS. > > Remember that in effect MS-DOS was an unlicensed copy of Digital > Research's CP/M and particularly CP/M-86. When the IBM PC was > launched, IBM offered a choice of 3 OSes: PC DOS, CP/M-86 and the UCDS > p-System (a bytecoded Pascal IDE and run-time environment.) >
The "MS-DOS was a copy of CP/M" story is a myth. They both referenced other operating systems, and likely Tim Paterson referenced the CP/M manual when implementing some internal features of Q-DOS to create PC-DOS (then MS-DOS) but there's been code comparisons and binary analysis by several folks, and none that I'm aware of concluded that DOS was a copy of CP/M. Here's one example: https://www.embedded.com/was-dos-copied-from-cp-m/ _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
