unsigned short r256table[256];
unsigned char r256index;

void r256init() {
	int i,j,msb;
	j=42424;
	for(i=0;i<256;i++){
		r256table[i]=(unsigned short)(j=j*65539);
	}
	msb=0x8000;
	j=0;
	for(i=0;i<16;i++) {
		j=i*5+3;
		r256table[j]|=msb;
		r256table[j+1]&=~msb;
		msb>>=1;
	}
}

unsigned short r256() {
	int r;
	r=r256table[(r256index+103)&255]^r256table[r256index];
	r256table[r256index++]=r;
	return r;
}	

void AgbMain(){
	r256init();
	*(unsigned short*)0x4000000=0x403;
	*(unsigned short*)0x4000004=0;
	int x=120,y=80,c=0,oc;
	for(oc=0;oc<240*160;oc++) ((unsigned short*)0x6000000)[oc]=0x7FFF;
	unsigned short color;
	while(1) {
		oc=c; c=(r256()*3)>>16;
		switch(c) {
		case 0:
			x=(x>>1);y=(y>>1)+80;
			break;
		case 1:
			x=(x>>1)+120;y=(y>>1)+80;
			break;
		case 2:
			x=(x>>1)+60;y=(y>>1);
			break;
		}
		switch(c*3+oc) {
		case 0: color=0x001F; break;
		case 1: color=0x02BF; break;
		case 2: color=0x541F; break;
		case 3: color=0x03F5; break;
		case 4: color=0x03E0; break;
		case 5: color=0x57E0; break;
		case 6: color=0x7C15; break;
		case 7: color=0x7EA0; break;
		case 8: color=0x7C00; break;
		}
	((unsigned short*)0x6000000)[y*240+x]=color;
	}
}