code: function initTileCycles() {
  	var i,
  	    result = new Uint8Array( 400 );
  
  	for ( i = 7; i < 256; i += 8 ) {
  		result[ i ] = 1;
  	}
  	for ( i = 327; i < 336; i += 8 ) {
  		result[ i ] = 1;
  	}
  
  	return result;
  }
docs: Initialize tile fetch cycles.
  Returns a typed array containing a 1 at every cycle a background tile should be fetched.