MSVS 6.0 does not read BIOS interrupts

Whenever i input code which calls the mircoprocesser these errors occure

void VGAScreen (){
union REGS r;
r.h.ah = 0;
r.h.al = 0x13;
int86(0x10, &r, &r);
return;

\\error C2079: 'r' uses undefined union 'REGS'
\\error C2224: left of '.h' must have struct/union type
\\error C2224: left of '.h' must have struct/union type
\\warning C4013: 'int86' undefined; assuming extern returning int

So how do i make it so M$ compiles without errors????

This is a hopeless cause in VC++6.0 because it is a relatively modern compiler. You need to use an ancient compiler, try Borland 5.0 which supports DOS, and make sure you have a really old operating system.

Hmm... I hope Windows 98 is ancient!

Windows 9X is very ancient! Okay than you need an ancient compiler now.