Thread: Interrupt Handling

Hi,
I want to know how to interface with DOS/BIOS interrupts
e.g. INT10H,INT21H in VC++6.0 .
In older Borland compiler(v2.01) I know how to interface with
DOS/BIOS interrupts.e.g. following code was used:
#include<dos.h>
main()
{int ascii,scan;
union REGS i,o; /*i and o represent unions of type REGS*/
while(!kbhit());
i.h.ah=(some int value) /*to give input value*/
int86(22,&i,&o); /*fn int86 invokes interrupt 22*/
ascii=o.h.al; /*to get ascii value of key hited*/
scan=o.h.ah; /*to get scan value*/
}
Now same doesn't work in microsoft vc++6.0 or in
Borland command line 5.5 compiler.Because it doesn't
recognises REGS unoin.Also when I checked dos.h header file
I didn't found any REGS whereas in dos.h header file of Borland
2.01 compiler I found union REGS.
Can anyone tell what is correct code to interface with DOS/BIOS
routines in microsoft vc++6.0/borland5.5.Also do I need another
header file with dos.h. Please clarify.
Manmohan Singh.

Actually you can still do that even in XP. I've been messing around with the emulator and it seems like DOS is in there. Although there are several problems - namely it is slower than DOS really was...if you can believe that.

But so far all interrupts have worked. Check into getting DJGPP from www.delorie.com, but all of the Turbo C++ versions thus far also have worked. I have not tried BC45 and I'm quite sure it does not work since it's startup.asm code relied on being in a DOS environment.

As well Visual Basic for DOS and QBasic 7.1 and 4.5 also work inside of command under XP. So I take back some of the things I once said about the XP emulator. I truly think now that most of DOS is there and most things will still work in it.