This expansion board came with my Atom but I have no idea what it is. I stuck the gold stickers over the three ROMs to prevent them becoming erased when I took pictures of them. I don't know what they do or whether there should be a fourth ROM present.

I daren't take the chips out and try to read them in my EPROM programmer for fear of damaging them.

It is interesting to think that this little board was issued in February 1983, or later, two years after the Atom ended production to be replaced by the BBC micro.