That's possible but a large chunk of memory...
Not so large, is it? If it were possible, which it isn't, it would be just 256*513 bytes, about 128 KiB.
But it's not possible as such, since the declaration of
String[SomeLenght] is meant for old-style "short" strings, which cap at
255 ($FF) chars. One has to use some workaround, such as using
array of char or (probably better) new-style
ansistring.