Programming :: Selecting VGA Planes Causes Existing Pixels To Change Colors?

using the code

Code:

void setplane(unsigned char mask){
inportb(0x3DA); //Reset the VGA flip/flop
unsigned char c=inportb(0x3C0); /*the VGA does not like you not saving values*/

[code]....

does not work, for example if setplane(1); will change all pixels plotted to blue - not just the newest. and here is how i plot pixels:

Code:

void ppixel(unsigned x, unsigned y, unsigned char color){
setplane(color);
((char far *)0xA0000000L)[(y*(640/8))+(x/8)]=((1<<7)>>(x%8));
}