4 ms·

whyever? technically correct is the /best/ sort of correct.

• bonzini 6y ago
  What is DOS? Is it COMMAND.COM (of which the Windows command prompt is indeed a descendant) or the API underneath (INT 21H mostly)?
  • temac 6y ago
    cmd is rewritten. Most of DOS was in assembly language. Most of NT is not. At one point cmd maybe contained some straightforward translation to C of some pieces of assembly, but I'm not sure (I'm sure it was a mess though; it may have been cleaned up a little now) But cmd is surely quite compatible with command.com. With more capabilities, but still very compatible. And a deceivingly close user interface.
    • bonzini 6y ago
      Yeah I didn't mean a descendant source code-wise. But I would say that DOS is more the 16-bit API than COMMAND.COM.
      • mixmastamyk 6y ago
        It was a primitive program loader. msdos.sys, io.sys, and command.com Source is interesting, I took a look: https://github.com/microsoft/MS-DOS/tree/master/v2.0/source https://github.com/microsoft/MS-DOS/tree/master/v2.0/source