Offered here a Rare Tandy Model 1 Computer Expansion Interface. This unit appears to be complete in its original box as it includes sealed expansion covers, manual, cassette cable and connecting cable. I have no way to test this but it appears to have seen little if any use as many parts are still sealed in their original bags. Box is worn but amazingly still present. These are rarely seen, let alone packaged units.Please check put my other listings.