Was going to comment that this reminded me of the old S-100 bus, and looking at the ads in Byte, and reading Chaos Manor, but obviously that couldn't be it, it had to be something else entirely, clicked and was pleasantly surprised.
And I won't even mention that I have no idea how to use ED.
You don't get the satisfying tactile flick-click of the real thing, but still, for about 0.06% of us, this brings an enormous smile!
:)
I couldn't figure it out so they just got rid of it. Wish I could go back in time and try again.