DOS ain't dead - With DPMI into protect mode and back

With DPMI into protect mode and back (Developers)

posted by Japheth , Germany (South), 18.10.2010, 11:17
(edited by Japheth on 19.10.2010, 08:22)

> Here's a sample using the int 31h, ax=0301h method - it's a slightly
> modified dpmicl16.asm which is supplied with FD DEBUG:
>
> [snipped] >

It's probably worth to be noted that it was this example which made me aware that DEBUG v1.18 wasn't able to reset its breakpoints when a mode switch occured in the debuggee ( fixed in v1.19 ).

Another note: the bugfix for v1.19 includes a temporary mode switch inside the debugger under certain conditions. Debug uses DPMI raw-mode switches for this. It has turned out that this approach won't work with CWSDPMI v5. HDPMI, Windows 9x/ME and Windows XP are ok. DosEmu is untested yet.

Edit: DosEmu is also ok.

---
MS-DOS forever!

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Complete thread:

With DPMI into protect mode and back - Laaca, 13.08.2010, 10:36 (Developers)
- With DPMI into protect mode and back - EDIT: example - ecm, 13.08.2010, 14:30
  - With DPMI into protect mode and back - EDIT: example - DOS386, 26.08.2010, 09:18
    - With DPMI into protect mode and back - EDIT: example - ecm, 26.08.2010, 14:35
      - With DPMI into protect mode and back - EDIT: example - DOS386, 27.08.2010, 03:33
        With DPMI into protect mode and back - EDIT: example - ecm, 30.08.2010, 21:51
        With DPMI into protect mode and back | physical memory - DOS386, 06.09.2010, 20:08
        With DPMI into protect mode and back | physical memory - ecm, 07.09.2010, 17:04
        With DPMI into protect mode and back | physical memory - DOS386, 08.09.2010, 00:51
        With DPMI into protect mode and back | physical memory - ecm, 08.09.2010, 20:53
        With DPMI into protect mode and back | physical memory - DOS386, 11.09.2010, 01:02
        With DPMI into protect mode and back | physical memory - ecm, 11.09.2010, 01:25
- With DPMI into protect mode and back - Japheth, 18.08.2010, 08:04
  - With DPMI into protect mode and back - Japheth, 18.10.2010, 11:17
    - With DPMI into protect mode and back - Rugxulo, 18.10.2010, 23:07
      - With DPMI into protect mode and back - Japheth, 19.10.2010, 09:58
        With DPMI into protect mode and back - Rugxulo, 19.10.2010, 10:09
        With DPMI into protect mode and back - Japheth, 19.10.2010, 10:20
        Possible CWSDPMI design flaw - Japheth, 19.10.2010, 17:59