                     OVERSCAN

With this pattern you can interactively find out
the overscan in pixels and percentage of each
edge in a display.

- Increment the overscan with left and right until
you see the white border, then go back one pixel.
The resulting number is the amount of overscan
in pixels in each direction.

- Button I allows faster movement of the borders.

This pattern follows the current vertical option,
so you can check how it handles in 239, 240, and
224 modes. Keep in mind the horizontal resolution
is fixed at 256 pixels.

- The rows colored in yellow rows are never shown
by original hardware.
