I created a program called Stress-Tables, it works OK until it exists, then it gives the following error message

STRESS-TABLES executed an invalid instruction in
module <unknown> at 0000:0000054f.

leaving the dos window open, when the window is closed manually the computer appears to have suffered no ill effects.  The last command in the program was a printf statement, which appears to have worked OK.  If you close the dos window by clicking the cross, the program shuts down OK.  The program is 520KB in size, most of that is data.  When the program was being developed it worked fine, but as it got bigger this problem started to occur.

Many Thanks

John

I suspect that somewhere in the program, a malloc or new is being done, and
the result is not checked for NULL. It's also possible you're having a stack
overflow (too much recursion). What I strongly suggest is porting the
program to Win32, thoroughly test/debug it there, and then back port it to
DOS.
 -Walter

"John Dyson" <post@gowelding.com> wrote in message news:au4nme$1dim$1@digitaldaemon.com...
>
> I created a program called Stress-Tables, it works OK until it exists,
then
> it gives the following error message
>
> STRESS-TABLES executed an invalid instruction in
> module <unknown> at 0000:0000054f.
>
> leaving the dos window open, when the window is closed manually the
computer
> appears to have suffered no ill effects.  The last command in the program was a printf statement, which appears to have worked OK.  If you close the dos window by clicking the cross, the program shuts down OK.  The program
is
> 520KB in size, most of that is data.  When the program was being developed it worked fine, but as it got bigger this problem started to occur.
>
> Many Thanks
>
> John
>
>