DOS ain't dead - MPXplay under CWSDPMI

MPXplay under CWSDPMI (Users)

posted by Japheth , Germany (South), 16.10.2010, 19:31

> Does anybody know why MPXplay (at least the DOS4G version) always crashes
> with loaded CWSDPMI? (via cwsdpmi -p)
> It writes a nice crash report but doesn't work. Doesn't matter if I run
> cwsdpmi r5 or cwsdpmi r7.

The problem is that there are 2 types of DPMI hosts: either plain hosts, which supply just the DPMI interrupts as documented; or full hosts which "are" DOS-extenders, that is, they additionally provide DOS int 21h translation services.

cwsdpmi belongs to the first pile, while hdpmi belongs to the second.

> It is problem on MPXplay side or on CWSDPMI side?

I guess that MPXplay checks on startup if a DPMI host is installed and, when one is found, uses it. It probably assumes that the host which it has found is a "full" host and makes no further checks. If so, then it's a bug of MPXplay.

However, the API how to check whether the DPMI host is "plain" or "full" is undocumented :-D - so it's a bit questionable to blame the author of MPXplay.

---
MS-DOS forever!

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Complete thread:

MPXplay under CWSDPMI - Laaca, 16.10.2010, 17:25 (Users)
- MPXplay under CWSDPMI - ecm, 16.10.2010, 18:40
  - MPXplay under CWSDPMI - Rugxulo, 17.10.2010, 01:39
    - MPXplay under CWSDPMI - ecm, 17.10.2010, 01:56
      - MPXplay under CWSDPMI - Rugxulo, 17.10.2010, 06:02
        MPXplay under CWSDPMI - DOS386, 23.10.2010, 09:08
        MPXplay under CWSDPMI - Rugxulo, 23.10.2010, 10:43
        MPXplay under CWSDPMI - DOS386, 23.10.2010, 10:56
        MPXplay under CWSDPMI - Rugxulo, 24.10.2010, 01:14
        CWSDPMI assembler port - ecm, 23.10.2010, 18:02
        CWSDPMI assembler port - Rugxulo, 24.10.2010, 01:30
    - MPXplay under CWSDPMI - Laaca, 17.10.2010, 10:08
      - MPXplay under CWSDPMI - Rugxulo, 17.10.2010, 15:46
        MPXplay under CWSDPMI - Laaca, 17.10.2010, 17:33
        MPXplay under CWSDPMI - Rugxulo, 17.10.2010, 23:23
- MPXplay under CWSDPMI - Japheth, 16.10.2010, 19:31
  - MPXplay under CWSDPMI - ecm, 16.10.2010, 19:34
    - MPXplay under CWSDPMI - Japheth, 17.10.2010, 07:55
  - MPXplay under CWSDPMI - RayeR, 26.10.2010, 18:30
  - MPXplay under CWSDPMI - Mpxplay, 28.10.2010, 08:48
    - MPXplay under CWSDPMI - Rugxulo, 28.10.2010, 11:41
      - MPXplay under CWSDPMI - Mpxplay, 28.10.2010, 15:01
        MPXplay under CWSDPMI - Japheth, 28.10.2010, 15:50
        MPXplay under CWSDPMI - RayeR, 28.10.2010, 21:08
        MPXplay under CWSDPMI - Laaca, 29.10.2010, 07:44
        MPXplay under CWSDPMI - RayeR, 30.10.2010, 22:06
        MPXplay under CWSDPMI - Japheth, 03.11.2010, 20:50
        MPXplay under CWSDPMI - RayeR, 04.11.2010, 00:00
        MPXplay under CWSDPMI - Rugxulo, 04.11.2010, 06:24
        MPXplay under CWSDPMI - RayeR, 04.11.2010, 10:25
        Eternity (engine) + FreeDoom (data) - Rugxulo, 04.11.2010, 12:20
        Eternity (engine) + FreeDoom (data) - RayeR, 04.11.2010, 14:07
        MPXplay under CWSDPMI - Japheth, 04.11.2010, 07:20
        MPXplay under CWSDPMI - Rugxulo, 04.11.2010, 09:03
        MPXplay under CWSDPMI - RayeR, 04.11.2010, 10:27
        MPXplay under CWSDPMI - RayeR, 04.11.2010, 14:10
        MPXplay under CWSDPMI - Laaca, 06.11.2010, 19:17
        MPXplay under CWSDPMI - Mpxplay, 08.11.2010, 12:31
        Mpxplay v1.57 beta 9 is out - Mpxplay, 15.11.2010, 12:03
        Mpxplay v1.57 beta 9 is out - Laaca, 15.11.2010, 16:32
        Mpxplay v1.57 beta 9 is out - Mpxplay, 15.11.2010, 17:16
        Mpxplay v1.57 beta 9 is out - Rugxulo, 15.11.2010, 19:43
        Mpxplay v1.57 beta 9 is out - Mpxplay, 16.11.2010, 00:15
        Mpxplay v1.57 beta 9 is out - Rugxulo, 16.11.2010, 14:01
        Mpxplay v1.57 beta 9 is out - Mpxplay, 16.11.2010, 20:46
        Mpxplay v1.57 beta 9 is out | WEBM - DOS386, 17.11.2010, 04:02
        Mpxplay v1.57 beta 9 is out | WEBM - Mpxplay, 17.11.2010, 13:08
        Mpxplay v1.57 beta 9 is out | WEBM - DOS386, 17.11.2010, 13:36
        Mpxplay v1.57 beta 9 is out | WEBM - Mpxplay, 17.11.2010, 20:47
        Mpxplay v1.57 beta 9 is out | WEBM - Mpxplay, 17.11.2010, 22:50
        Mpxplay v1.57 final is out | Ogg problems - Mpxplay, 26.11.2010, 05:44
        Mpxplay v1.57 beta 9 is out - Laaca, 04.12.2010, 21:09
        Mpxplay v1.57 beta 9 is out - Mpxplay, 11.12.2010, 22:02
        Mpxplay v1.57 beta 9 is out - RayeR, 12.12.2010, 14:12
        Mpxplay v1.57 - Rugxulo, 12.12.2010, 23:23
        Mpxplay v1.57 - Mpxplay, 12.12.2010, 23:58
        Mpxplay v1.57 and 1.58 - DOS386, 21.12.2010, 16:22
        Seems to be about TENNIS rather than MPXPLAY - DOS386, 24.12.2010, 08:45
        Mpxplay v1.57 and 1.58 - Rugxulo, 25.12.2010, 01:11
        Mpxplay v1.57 and 1.58 - DOS386, 26.12.2010, 09:21
        Mpxplay v1.57 and 1.58 - Laaca, 26.12.2010, 13:20
        Mpxplay v1.57 and 1.58 - INI and CFG stuff - DOS386, 27.12.2010, 08:42
        Mpxplay v1.57 and 1.58 - INI and CFG stuff - Mpxplay, 27.12.2010, 17:24
        Mpxplay v1.57 and 1.58 - INI and CFG stuff - DOS386, 30.12.2010, 09:45