Yes, of course it is... Its the same as one of the 4 other serial ports, but I was more thinking of its use?
I might see if I can get hold of a cable for it, and see if I can write something that can make use of it perhaps?? - If only to get the TT to talk to the Falcon.
Besides, I need to have a bit of practice as I have not done any Atari programmign for some years now, I am back on the