🚀 go-pugleaf

I'm having lots of trouble trying to handle DOS fatal errors.
I've written a routine in assembler and initialised the
interrupt vector with its address (interrupt 24H). The routine
gets called ok but either the program screws up a bit later
or completely hangs. In the routine, I just restore all the user
registers from the stack and do an "iret" with just the ip, cs
and flags (from when I called bios) left on the stack. I also
try saving the error id (from di) in a program global variable
(after having restored ds) and this seems to get set ok.
Alternatively, I have also tried just saving di in a variable
carefully placed in the code segment, setting al to 0 and
doing an iret to let dos handle the stack. The results are
equally disasterous.

I would greatly appreciate any hints, help or other wisdom
on the subject. Thanks in advance (and I will also personally
thank any responders afterwards!).