Simulated telephone

Alas not. It was made by a company called 'Computer Devices Inc' and claims to be a 'Miniterm 1203' Does anyone have any more infoemtion? I have no idea. I cna't remember what's inside, but I seem to recall some kind of microprocessor/microcontroller, so it could do some error detection. It might just take Intel Hex or somethign, which has a checksum on every line (and many characters are invalid anyway), which I think would detect erros fro, say, a noisy phone line. I am still thinking about this. It would appear the cheaper small telephone exchanges do not meet by 'repairable' requirement, and quite possibly the line simulators don't eiterh. A UAX (Unit Automatic eXchange) -- all relays and 2 motion selectors -- would (I even have schematics and theory-of-operation for some of those on the bookshelf, but I have nowhere to put one :-). I think I can make a simple (no dialtone/ringtone) line simulator in aobut 4 ICs, though, all common parts. Must be worth a try... [...] Taht reminds me... I have an A-J acoustic coupler ina wooden box somewhere... I don';t fancy tryign to get reliable operation from an acoustic coupler mounted right next to an ASR33 typing unit., but anyway... -tony