Transform your PC into a professional observatory with the Expert Astronomer Vintage Expert Software. This unit, made in the United States, includes a 5 1/4 disk for Tandy/IBM computers. The software, which is a vintage manual and merchandise, is perfect for vintage computing enthusiasts and astronomers alike. With no modifications made to the unit, this software is in excellent working order and has been well-preserved for over 28 years. Don't miss out on the opportunity to own this rare and valuable piece of computing history.