SPRITE SCROLL x, y [,col]
Scrolls the background and any sprites on the active framebuffer (L or N) x pixels to the right and y pixels up. x can be any number between - MM.HRES-1 and MM.HRES-1, y can be any number between -MM.VRES-1 and MM.VRES-1. Sprites on any layer other than zero will remain fixed in position on the screen. By default the scroll wraps the image round. If col is specified the colour will replace the area behind the scrolled image. If col is set to -1 the scrolled area will be left untouched.