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I still have my original Digi Comp I from the 1960s, and all of the books that ESR published to go along with it. I have also written a book of 41 additional activities to play on the machine, and the book supplied with the new Digi Comp version 2 offered by Minds On Toys offers 30 more. That's more than 130 activities to program and play on a 3-bit plastic computer! Not bad! Check the friendsofDigiComp groupsite for more history.