DOS ain't dead - DS and ES matching

DS and ES matching - PDB meaning (Developers)

posted by kerravon , Ligao, Free World North, 18.10.2025, 19:59

> BTW, I think the DOS 4 MT we have is quite old. I went through the
> documentation,
> and so far I haven't seen a reference to what the segment registers are on
> entry.

This looks like what I remembered:

https://pcdosretro.gitlab.io/multitaskingmsdos4.htm

and the lack of PSP is just for NE executables.

Still - that is of interest too.

Assuming NE executables could do INT 21H - which I believe they
can, then I expect my MSDOS code to work after being processed
through a "reformat" tool to convert from MSDOS format to NE
format, and I expect it to continue working on MSDOS 4 MT.

In fact, I can even allow for the AHINCR and AHSHIFT to be accepted
and used for the huge algorithm in that situation, by placing them in
a known spot, like after the first relocation, which is a DGROUP
reference.

So some sort of informal/hidden markup.

So that no-one can say it is a non-standard MSDOS executable.
Because it totally is.

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Complete thread:

DS and ES matching - kerravon, 18.10.2025, 11:29
- DS and ES matching - ecm, 18.10.2025, 12:48
  - DS and ES matching - kerravon, 18.10.2025, 14:43
    - DS and ES matching - PDB meaning - ecm, 18.10.2025, 18:32
      - DS and ES matching - PDB meaning - kerravon, 18.10.2025, 19:04
        DS and ES matching - PDB meaning - ecm, 18.10.2025, 19:41
        DS and ES matching - PDB meaning - kerravon, 18.10.2025, 19:59
        DS and ES matching - PDB meaning - kerravon, 18.10.2025, 20:01
- DS and ES matching - kerravon, 19.10.2025, 10:32