I have a keyboard that seems unusual. Trying to identify what it is. The box says RIII keyboard ass'y.. There are blue buttons that say Send., Receive, commad Message, Break Clear. On the number keys there are also symbols and there is a small keyboard to the right of the numbers that say Field, End field begin, Field erase, scroll, up arrow, srol 2, left arrow, home, right arrow, scrol 3, down arrow and scroll 4. I can't figure out how to add pictures here. Anyone know what it is???