All,
I found a 5 year old post in Greenkeys on a discussion concerning this board.
Circa Thu, Dec 10 17:58:32 EST 2020.

In the discussion there are references to the schematic being attached,
but it's no longer attached.

Being a newbie to Greenkeys is there a way to pull up old posts?

If not, does anyone have information on this board?

Many thanks in advance.

Dave, K4MCG