Thanks John, that was a typo. John R. Hogerhuis wrote: > On Mon, 2006-01-23 at 16:49 -0500, Robert Gault wrote: > > >>Registers $ff9d and $ffde are the 16 bit vertical offset. The value > > > I think you meant that $ff9d and $ff9e are the 16 bit vertical offset. > > -- John. > >