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Initialising Video Modes
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How can I initialise different video modes... like SVGA 800x600 mode, EGA 640x350 mode, et cetera using interrupts... what exactly must I do? Could you demonstrate an example or two for EGA 640x350 and how I can then write to the memory? Thank you.
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Originally Posted by JC_McGeekster 
How can I initialise different video modes... like SVGA 800x600 mode, EGA 640x350 mode, et cetera using interrupts... what exactly must I do? Could you demonstrate an example or two for EGA 640x350 and how I can then write to the memory? Thank you.
and to change the video mode, use
int10h F : 0 interrupt
a simple code for you...
void set_video_mode(int vmode) { union REGS regs; regs.h.ah = 0; regs.h.al = vmode; int86(0x10, ®s, ®s); } int main(void) { set_video_mode(1); printf(“hello world!\n”); getch(); return 0; }
Yes, very well.. I already knew this much. Say I set vmode to 10....
How can I now write to the video memory, displaying a pixel somewhere??
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10h = G 80x25 8x14 640x350 4 2 A000 64k EGA
= G 640x350 16 A000 256k EGA,VGA
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Originally Posted by JC_McGeekster
Yes, very well.. I already knew this much. Say I set vmode to 10....
How can I now write to the video memory, displaying a pixel somewhere??
void writep(int row, int col, int color) { union REGS regs; regs.h.ah = 0x0c; regs.h.al = color; regs.h.bh = 0; regs.x.dx = row; regs.x.cx = col; int86(0x10, ®s, ®s); } int main(void) { set_video_mode(16); writep(100, 100, WHITE); getch(); set_video_mode(3); return 0; }
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Join Date: Aug 2005
Posts: 15,358
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writing to video ram is easy as writing to any other ram -- just set a pointer to 0xA0000:0000 and write to it. But be warned that it will be ungodly sloooooow. Here is a link to some more useful information
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
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