Pronto ID in Buy, Sell, and Trade Posted September 9 6 hours ago, Professor Falken said: A friend recently purchased a lot of Atari computer carts. My knowledge of these is zero. One of the carts is called Pronto the home information system. He knows I am a big Atari guy but when it comes to Atari computers I couldn’t help him. He believes it to be rare and possibly valuable. Can any one help with identifying and valuing this thing ? Can’t find anything online. thank you. You could easily get $100 for that on ebay.