> Okay, this is just weird.
> I can’t for the love of god figure out why this is throwing the divide by
> zero interrupt.
a) learn to use a debugger. single step this stuff. you will likely see
that 'ret' is not a good idea in inline assembly in general.
also
WDIS graphic.obj > graphic.txt
shows you why some instructions in inline assembly are usually
forbidden.
b) don't use assembly for this.
#include <dos.h>
int setMCGA() {
_REGS r;
r.h.ah = 0x13;
_int86(0x10, &r, &r);
if (r.flags & _CARRY)
{
printf("setting MCGA failed because %x\n", r.h.al);
return 1;
}
return 0;
}
does the same, works with every compiler around and avoids this
trouble.
last not least,
INT 10 - VIDEO - SET VIDEO MODE
AH = 00h
AL = desired video mode (see #00010)
> void setMCGA() {
> _asm {
> mov al, 0x13
> int 0x10
> ret
> }
> }
> void setText() {
> _asm {
> mov al, 0x03
> int 0x10
> ret
> }
> }
> void clearScreen(char color) {
> int i;
> for (i = 0xa000; i < 0xfa00; i++) {
> char* byte = i;
> *byte = color;
> }
> }
> int main(int argc, char** argv) {
> setMCGA();
> clearScreen(255);
> getchar();
> setText();
> return 0;
> }
> _______________________________________________
> Freedos-devel mailing list
> Freedos-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/freedos-devel
Mit freundlichen Grüßen / with kind regards
Tom Ehlert
+49-15151898538
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