DOS ain't dead - EDR-DOS bugs on int 21h functions 7142h and 71A6h

EDR-DOS bugs on int 21h functions 7142h and 71A6h (Announce)

posted by ecm , Düsseldorf, Germany, 13.08.2023, 14:39

> > I don't think I can make these changes alone. I'm not that familiar with
> > the DOS kernel.
>
> I can prepare a patch later.
>
> I tested MSWindows 95 (on pcjs) and a device handle works a little
> differently than on EDR-DOS:
>
> * Function 42h allows to seek anywhere, as if the device is a file of
> length zero.
>
> * Function 71A6h returns with CY set (even if input was NC, that is not "CF
> unchanged"), AX=7100h.

Running function 71A6h on a file on a redirector file system (Phantom 3.0) MSW 95 also appears to return CY, AX=7100h.

---
l

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Complete thread:

New version DRDOS 7.01.7 & 7.01.8 - CandyMan, 21.07.2023, 15:40 (Announce)
- New version DRDOS 7.01.7 & 7.01.8 - glennmcc, 21.07.2023, 20:13
- New version DRDOS 7.01.7 & 7.01.8 - nico7550, 21.07.2023, 20:27
  - New version DRDOS 7.01.7 & 7.01.8 - fritz.mueller, 21.07.2023, 20:29
    - New version DRDOS 7.01.7 & 7.01.8 - glennmcc, 21.07.2023, 20:34
  - New version DRDOS 7.01.7 & 7.01.8 - CandyMan, 21.07.2023, 22:18
    - New version DRDOS 7.01.7 & 7.01.8 - nico7550, 21.07.2023, 22:45
      - New version DRDOS 7.01.7 & 7.01.8 - nico7550, 22.07.2023, 09:40
        New version DRDOS 7.01.7 & 7.01.8 - CandyMan, 22.07.2023, 23:06
- New version DRDOS 7.01.7 & 7.01.8 - Guti, 24.07.2023, 11:08
- New version DRDOS 7.01.7 & 7.01.8 - CandyMan, 25.07.2023, 15:04
  - New version DRDOS 7.01.7 & 7.01.8 - nico7550, 26.07.2023, 15:19
    - New version DRDOS 7.01.7 & 7.01.8 - Guti, 30.07.2023, 11:12
- New version DRDOS 7.01.7 & 7.01.8 - DieTotenByte, 30.07.2023, 01:09
  - New version DRDOS 7.01.7 & 7.01.8 - CandyMan, 30.07.2023, 10:55
- New version DRDOS 7.01.7 & 7.01.8 - CandyMan, 03.08.2023, 21:46
- New version DRDOS 7.01.7 & 7.01.8 - CandyMan, 10.08.2023, 11:09
  - New version DRDOS 7.01.7 & 7.01.8 - ecm, 10.08.2023, 15:52
    - New version DRDOS 7.01.7 & 7.01.8 - CandyMan, 10.08.2023, 19:21
    - New version DRDOS 7.01.7 & 7.01.8 - CandyMan, 11.08.2023, 10:47
      - EDR-DOS bugs on int 21h functions 7142h and 71A6h - ecm, 12.08.2023, 21:13
        EDR-DOS bugs on int 21h functions 7142h and 71A6h - CandyMan, 13.08.2023, 11:16
        EDR-DOS bugs on int 21h functions 7142h and 71A6h - ecm, 13.08.2023, 13:59
        EDR-DOS bugs on int 21h functions 7142h and 71A6h - ecm, 13.08.2023, 14:39
        EDR-DOS bugs on int 21h functions 7142h and 71A6h - CandyMan, 13.08.2023, 19:23
        EDR-DOS bugs on int 21h functions 7142h and 71A6h - ecm, 13.08.2023, 21:41
        EDR-DOS bugs on int 21h functions 7142h and 71A6h - CandyMan, 13.08.2023, 22:41
        EDR-DOS bugs on int 21h functions 7142h and 71A6h - ecm, 13.08.2023, 23:18
        EDR-DOS bugs on int 21h functions 7142h and 71A6h - CandyMan, 13.08.2023, 23:51
        EDR-DOS development - ecm, 14.08.2023, 07:18
        EDR-DOS development - CandyMan, 14.08.2023, 09:43
        EDR-DOS development - ecm, 15.08.2023, 20:49
        EDR-DOS development - ecm, 15.08.2023, 20:51
        EDR-DOS development - ecm, 19.08.2023, 19:56
        EDR-DOS development - CandyMan, 14.08.2023, 14:35
        EDR-DOS development - bretjohn, 14.08.2023, 21:12
        EDR-DOS development - CandyMan, 15.08.2023, 11:49
        EDR-DOS development - ecm, 15.08.2023, 20:46
        EDR-DOS development - CandyMan, 15.08.2023, 22:29
        EDR-DOS development - ecm, 16.08.2023, 10:06
        EDR-DOS development - CandyMan, 16.08.2023, 12:54
        EDR-DOS development - ecm, 16.08.2023, 18:19
        EDR-DOS development - CandyMan, 16.08.2023, 18:55
        EDR-DOS development - ecm, 20.08.2023, 01:35
        EDR-DOS development - CandyMan, 21.08.2023, 00:27
        EDR-DOS development - ecm, 21.08.2023, 22:54
        EDR-DOS development - ecm, 29.08.2023, 17:49
        EDR-DOS development - ecm, 29.08.2023, 18:26
        EDR-DOS development - ecm, 29.08.2023, 18:32
        EDR-DOS development - ecm, 29.08.2023, 18:49
        EDR-DOS development - Rugxulo, 29.08.2023, 23:28
        EDR-DOS development - ecm, 30.08.2023, 09:47
        EDR-DOS development - roytam, 29.12.2023, 15:33
        EDR-DOS repository - Ro2003, 10.10.2023, 16:24
        EDR-DOS repository - ecm, 12.10.2023, 19:04
        EDR-DOS repository - Ro2003, 13.10.2023, 08:23
        EDR-DOS repository - nico7550, 13.10.2023, 15:53
        EDR-DOS repository - Single-file kernel load - ecm, 13.10.2023, 18:16
        EDR-DOS repository - Single-file kernel load - ecm, 13.10.2023, 18:23
        EDR-DOS version number - Ro2003, 10.10.2023, 16:32
        EDR-DOS version number - ecm, 12.10.2023, 19:08
- New version DRDOS 7.01.7 & 7.01.8 - glennmcc, 13.08.2023, 22:19
  - What ever happened to Udo ? - glennmcc, 29.08.2023, 23:04
  - New version DRDOS 7.01.7 & 7.01.8 - Ro2003, 10.10.2023, 16:10
    - New version DRDOS 7.01.7 & 7.01.8 - glennmcc, 10.10.2023, 21:35
- New version DRDOS 7.01.7 & 7.01.8 - boeckmann, 12.12.2023, 17:04
  - New version DRDOS 7.01.7 & 7.01.8 - ecm, 12.12.2023, 18:47
    - New version DRDOS 7.01.7 & 7.01.8 - boeckmann, 12.12.2023, 21:15
      - New version DRDOS 7.01.7 & 7.01.8 - boeckmann, 12.12.2023, 21:27
        New version DRDOS 7.01.7 & 7.01.8 - CandyMan, 13.12.2023, 16:58
        New version DRDOS 7.01.7 & 7.01.8 - boeckmann, 14.12.2023, 18:00
        New version DRDOS 7.01.7 & 7.01.8 - ecm, 14.12.2023, 20:58
        New version DRDOS 7.01.7 & 7.01.8 - boeckmann, 16.12.2023, 21:52
        New version DRDOS 7.01.7 & 7.01.8 - ecm, 30.12.2023, 14:27
        New version DRDOS 7.01.7 & 7.01.8 - boeckmann, 01.01.2024, 13:57