Looks like I was wrong. Took this off another older thread fyi: "Actually I think the story goes that when Block went bankrupt 3 companies bought the rights to the software. Blackwood, Andover, and I don't remember the name of the third one all got the old Block software they had been developing. From there they all added their own features to the software. So they look the same but they all had different keys and functions developed for them by their own programmers." Had almost forgotten about Block. Man that is going wayy back.