DOS ain't dead - Considering MS-DOG (inside NTVDM)

Considering MS-DOG (inside NTVDM) (Users)

posted by RayeR , CZ, 02.08.2011, 19:58

> Afaik it is not just OS. If you switch a x86 CPU to 64-bit mode, then you
> can't run 16-bit code natively. (because then the "alternate" mode is
> already pinned to 32-bit)

Yes. AFAIK NTVDM on 32bit windows use virtual x86 mode (that allows 32bit supervisor running 16bit sessions) to run most of 16bit code native. But when 64bit OS turn CPU to long mode it has no such capability as v86 mode (CPU engineers saved some transistors and didn't implement this legacy stuff) so you need true PC emulator then. But if I remember well I read something that 64bit linux dosemu works and can exec some 16bit code native but not sure... It's probably some experimental hack...
EDIT: from dosemu whatsnew:
- Added a native 64-bit port for x86-64, which, by default, uses CPU emulation
for V86 mode, and runs DPMI code natively.
so it seems run only dos 32bit progs native, i'm not sure...3

---
DOS gives me freedom to unlimited HW access.

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Complete thread:

Considering MS-DOS - paulrichards, 30.07.2011, 04:29 (Users)
- Considering MS-DOS - Japheth, 30.07.2011, 07:37
  - Considering MS-DOS - paulrichards, 31.07.2011, 01:49
- Considering MS-DOS - Rugxulo, 30.07.2011, 13:52
  - Considering MS-DOS - paulrichards, 31.07.2011, 01:54
- Considering DOS - DOS386, 30.07.2011, 15:17
  - Considering DOS - paulrichards, 31.07.2011, 01:56
- Considering MS-DOS - Dennis, 30.07.2011, 20:43
  - Considering MS-DOS - rr, 30.07.2011, 21:57
    - Considering MS-DOS - Dennis, 30.07.2011, 22:39
  - Considering MS-DOS - rr, 30.07.2011, 22:13
    - Considering MS-DOS - Dennis, 30.07.2011, 22:31
  - Considering MS-DOS - paulrichards, 31.07.2011, 02:06
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      - Considering MS-DOS - paulrichards, 31.07.2011, 03:22
        Considering MS-DOS - Rugxulo, 31.07.2011, 03:50
        Considering MS-DOS - paulrichards, 31.07.2011, 04:34
        Considering MS-DOS - Dennis, 31.07.2011, 03:53
        Considering MS-DOS - paulrichards, 31.07.2011, 04:37
        Considering MS-DOS - ron, 31.07.2011, 06:57
        Considering MS-DOS - paulrichards, 31.07.2011, 07:19
        Considering MS-DOS - ron, 31.07.2011, 08:02
        Considering MS-DOS - paulrichards, 31.07.2011, 10:40
        Considering MS-DOS - Dennis, 31.07.2011, 17:05
        Considering MS-DOS - paulrichards, 01.08.2011, 01:39
        Considering MS-DOS - ron, 31.07.2011, 23:59
        Considering MS-DOS - paulrichards, 01.08.2011, 01:41
        Considering MS-DOS - marcov, 01.08.2011, 14:49
        Considering MS-DOS - Dennis, 02.08.2011, 16:01
        Considering MS-DOS - Dennis, 31.07.2011, 17:18
        Considering MS-DOS - w3a537, 02.08.2011, 10:25
  - Considering MS-DOG (inside NTVDM) - DOS386, 02.08.2011, 15:25
    - Considering MS-DOG (inside NTVDM) - Dennis, 02.08.2011, 15:48
      - Considering MS-DOG (inside NTVDM) - marcov, 02.08.2011, 18:56
        Considering MS-DOG (inside NTVDM) - RayeR, 02.08.2011, 19:58
        Considering MS-DOG (inside NTVDM) - Rugxulo, 05.08.2011, 23:06
        Considering MS-DOG (inside NTVDM) - RayeR, 12.08.2011, 03:09
        Considering MS-DOG (inside NTVDM) - DOS386, 04.08.2011, 11:29
        Considering MS-DOG (inside NTVDM) - marcov, 04.08.2011, 21:59
        Considering MS-DOG (inside NTVDM) - Dennis, 06.08.2011, 04:01
  - Considering MS-DOS - RayeR, 03.08.2011, 00:53
    - Considering MS-DOS - Dennis, 03.08.2011, 02:02
      - Considering MS-DOS - RayeR, 03.08.2011, 12:13
        Considering MS-DOS - Dennis, 03.08.2011, 15:34
        Considering MS-DOS - RayeR, 03.08.2011, 18:38
        Considering MS-DOS - Dennis, 03.08.2011, 19:19
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        Considering MS-DOS - Dennis, 04.08.2011, 04:29
        Considering MS-DOS - marcov, 04.08.2011, 08:53
        Considering MS-DOS - Rugxulo, 05.08.2011, 23:15
        Considering MS-DOS - Dennis, 06.08.2011, 03:05
        Considering MS-DOS - Rugxulo, 06.08.2011, 04:43
        Considering MS-DOS - marcov, 06.08.2011, 13:12
        Considering MS-DOS - marcov, 06.08.2011, 13:04
        Considering MS-DOS - Dennis, 04.08.2011, 04:38