                    GRID (1/2)

This grid uses a #C320x240#C pattern, and should fill
all the 4:3 visible area. 

You can use it to verify that all the visible
area is being displayed, and that there is no
distortion present.

A #C640x480#C Grid can be shown in compatible NTSC
video modes. 

In PAL resolutions, there are also two different 
grids. 

                                   #C(cont...)#C
                    GRID (2/2)

In the 288p PAL video, only 264 are visible lines.
Since 264 is not an exact multiple of 16, there is
a centered line of smaller blue rectangles. 

In 576i unscaled 1:1 mode, a full #C640x528#C grid is
shown. 

The 240 test suite draws from line 22 onwards from 
the blanking interval of NTSC signals, and line 25
for PAL. It uses the whole visible area in both.

- You can press #GA#G to toggle the full signal video
border on and off.
