MS-DOS 1.0 used CP/M-80 System Calls to make it easier to port programs from CP/M to DOS. https://www.pcjs.org/documents/books/mspl13/msdos/encyclopedia/section

MS-DOS 1.0 used CP/M-80 System Calls to make it easier to port programs from CP/M to DOS. https://www.pcjs.org/documents/books/mspl13/msdos/encyclopedia/section5/ https://www.pcjs.org/documents/books/mspl13/msdos/encycloped... https://groups.google.com/g/comp.os.cpm/c/hj2M4TIRRKE https://groups.google.com/g/comp.os.cpm/c/hj2M4TIRRKE https://www.landley.net/history/mirror/ms/InsideDos.htm https://www.landley.net/history/mirror/ms/InsideDos.htm https://briancallahan.net/blog/20210606.html https://briancallahan.net/blog/20210606.html