AMOSi:Y Screen
an example can be found on AMOSPro_Examples:Examples/H-5/Help_50.AMOS
Converts a Y coordinate in hardware format into a SCREEN coordinate relative to the present screen.
sy=Y Screen(hy)
If you include an optional screen number in this function, the new coordinate will be relative to your chosen screen.
sy=Y Screen(screen number,hy)