DOS ain't dead

CM16 (Developers)

posted by kerravon , Sydney, Free World South, 09.04.2025, 10:05

> > Is anyone familiar with CM16 in x64 long mode?
>
> if with CM16 you mean "16-bit protected-mode" in Compatibility Mode, then
> yes.
> The
> Dos64-Stub
> program frequently switches between this mode and 64-bit long mode.

Thanks. I had some misunderstandings about both PM16
and CM16 but both have now been cleared up (ie CM16
isn't really a thing).

So yes, I do in fact just mean "compatibility mode"
and I "just" need to set all the selectors to 16-bit
and I should be able to run certain 16-bit programs.

I will likely do OS/2 1.0 programs first as NE
executables.

Then I can probably look at NE executables that run
under both Euro MSDOS 4.0 (which is now freely
available from Microsoft but I can't remember if I
got it to work) and PDOS/86 (x64 CM version).

I am mainly interested in huge memory model, so
one way or another I need to modify the MZ format
to include AHINCR/AHSHIFT adjustments in order to
support Microsoft-compiled executables. So I may
abandon standard MSDOS.

It might be good if Freedos could support NE
format though.

BFN. Paul.

Post reply

Complete thread:

CM16 - kerravon, 06.04.2025, 21:30 (Developers)
- CM16 - Japheth, 07.04.2025, 15:48
  - CM16 - kerravon, 09.04.2025, 10:05
    - CM16 - kerravon, 27.04.2025, 17:24
      - CM16 - kerravon, 27.04.2025, 18:36
        CM16 - kerravon, 27.04.2025, 19:57
        CM16 - kerravon, 27.04.2025, 20:15
        CM16 - kerravon, 28.04.2025, 15:40