void setPixel(int x, int y, unsigned int color)
{
	static unsigned char *scr = (unsigned char *) 0xa4000100;
	if(x >= 0 && x < 320 && y >= 0 && y < 240)
		scr[y*160+x/2]=x&1? (scr[y*160+x/2]&0xF0)+color : (scr[y*160+x/2]&0x0F)+(color<< 4);
}

void clrscr()
{
	int i,j;
	for(i = 0; i < 320; i ++)
		for(j = 0; j < 240; j ++)
			setPixel(i, j, 0xF);
}

int getPixel(int x, int y)
{
	static unsigned char *scr = (unsigned char *) 0xa4000100;
	if(x >= 0 && x < 320 && y >= 0 && y < 240)
		return x%2 ? scr[y*160+x/2] & 0x0F : (scr[y*160+x/2] & 0xF0) >> 4;
	return 0;
}
/*
void drawLine(unsigned int x1, unsigned int y1, unsigned int x2, unsigned int y2, unsigned int color)
{
    if(x2 < x1)
    {
        int tmp = x2;
        x2 = x1;
        x1 = tmp;
    }
    if(y2 < y1)
    {
        int tmp = y2;
        y2 = y1;
        y1 = tmp;
    }
    unsigned int numPts = 0, i;
    double x = x1, y = y1;
    unsigned int xi, yi;
    numPts = x2 - x1;
    if(y2 - y1 > numPts)
        numPts = y2 - y1;

}
*/