DOS ain't dead - not setting carry

not setting carry (Developers)

posted by kerravon , Ligao, Free World North, 17.10.2025, 16:51

> > > That means all calls above ah=6Ch are high.
> >
> > Thanks for all that effort to determine what was happening.
> >
> > I have documented that here:
> >
> >
> https://sourceforge.net/p/pdos/gitcode/ci/8274f934426a4cb78b86a92fc6fac30a07f58ef5/
>
> Addendum: MS-DOS v7.00 sets ax = 7100h and CY (set Carry Flag) on eg
> function 716Ch when running without the MSW v4 part. So that may be part of
> the reason it isn't well documented that you should stc for
> older MS-DOS.

I think that's covered by this:

Greater than 73H on MSDOS 7.0

It's only 74H and above that I am expecting to have the "carry issue"
on that particular version of MSDOS.

BFN. Paul.

Post reply

Complete thread:

not setting carry - kerravon, 16.10.2025, 10:29
- not setting carry - ecm, 16.10.2025, 16:17
  - not setting carry - bretjohn, 16.10.2025, 23:59
    - not setting carry - ecm, 17.10.2025, 09:30
  - not setting carry - kerravon, 17.10.2025, 07:58
    - not setting carry - ecm, 17.10.2025, 10:29
      - not setting carry - kerravon, 17.10.2025, 10:55
        not setting carry - ecm, 17.10.2025, 11:31
        not setting carry - kerravon, 17.10.2025, 16:51
        not setting carry - ecm, 17.10.2025, 18:43
        not setting carry - kerravon, 17.10.2025, 19:05