Looks like a Bodega Bay expansion for A500 ?
http://www.bboah.com/index.php?action=artikel&cat=76&id=3489&artlang=en
I do not think so. Even before looking at the pictures of the Zorro board on BBoAH I recalled a much different configuration than his picture.
My first thought was it is some kind of daughter board until he posted the brand. Interesting, though.
Sometimes I wish I had played with my Bodega Bay more before it wound up in the dump.
And I would be careful about just plugging things into the expansion slot of the 500 (or any computer, for that matter) all willy-nilly. Good way to release the magic blue smoke. That has to stay inside the chips for them to work.