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manas_ghosal

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Interrupt calling problem

I get a kernel error message when ever I call any interrupt say INT 21h, as for example I have used here INT 10H. I am using Visual Studio 6.0 to compile my code.
Please help me asap.
#include <stdio.h>
#include <conio.h>
void main(void)
{
     unsigned char row = 10;
     unsigned char col = 10;
        unsigned short counter = 5;
     __asm{
          MOV CX, counter
     AGAIN:  MOV AH,02H
          MOV BH, 0
          MOV DH, row
          MOV DL, col
          INT 10H
          PUSH CX
     }
printf("This is a test!");
row++;
col++;
__asm{
 POP CX
 DEC CX
 JNZ AGAIN
}
getch( );
}
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dimitry

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Avatar of DanRollins
>>I get a kernel error message when ever I call any interrupt...

This is because Windows is a protected-mode operating system.  Only programs with system-level access -- such as device drivers -- are allowed to use INT XX.  The opcode itself is trapped.  You will get similar protection violations if you do OUT xxx on a protected port, etc.

You can write a 16-bit app (if you can find an old compiler) and Windows will run it in a protect 'DOS Box' where it can be insulated from screwing up devices and systems.

As dimity says, you can use the 32-bit ConsoleI/O fns for screen output.  You will find that nearly everything you want to do has a parallel 32-bit function available.

Other than screen output, what other tasks do you need to perform?

-- Dan
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Thanks everyone.
Moondancer
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Lacking feedback from Asker, I submit that both DanRollins and dimitry had equally valid and useful responses.  I recommend a point split between these two experts.

-- Dan
as a lurker i second that recom ;)
Thanks, points have been split.

Points for DanRollins -> https://www.experts-exchange.com/jsp/qShow.jsp?qid=20302869

:) Moondancer - EE Moderator