What is the difference between the various interrupt functions?

[Johann 'Myrkraverk' Oskarsson]

Dear o.u.c_cpp,

OpenWatcom has several different interrupt routines, namely

int386
int386x
int86
int86x
intdos
intdosx
intr
intrf

and others. The C Library Reference doesn't include any hint on when I
should choose one function over another.

So far I've just used intr() because it's the first one I came across.
Is it any better to use int386() or int386x() in protected mode
applications?

If context matters, then for now I'm mostly interested in the int 33
mouse functions.

[Copied but not cross posted to the c.o.m.programmer newsgroup, because
I'm using different NNTP servers.]

[Steven Levine]

On Thu, 10 Oct 2019 15:53:57 UTC, Johann 'Myrkraverk' Oskarsson
<***@myrkraverk.invalid> wrote:

Hi Johann,

Post by Johann 'Myrkraverk' Oskarsson
OpenWatcom has several different interrupt routines, namely
int386
int386x
int86
int86x
intdos
intdosx
intr
intrf
and others. The C Library Reference doesn't include any hint on when I
should choose one function over another.

You need to choose the one that matches the bitness of the interrupt
function you are calling. For 16-bit code, use the intdos*()
function. For 32-bit code, use the int386*() functions.

intr() defines the parameters so that it can be used for either 16 or
32-bit routines.

I'm not familiar with intrf(). Perhaps it's something Jiri invented
or it is Fortran specific. I can't tell from what I can see.

Post by Johann 'Myrkraverk' Oskarsson
If context matters, then for now I'm mostly interested in the int 33
mouse functions.

My memory says these are all 16-bit functions.


Steven