Thanks, the "env" version works! Although the scroll is more fine grained now, it looks kinda wobbly. Almost as if there is a raster interrupt at play, lol. As

Thanks, the "env" version works! Although the scroll is more fine grained now, it looks kinda wobbly. Almost as if there is a raster interrupt at play, lol. As if the screen gets repainted mid scroll and then needs another round until the whole screen is updated.