That was my first introduction to the notion of checksums and parity bits too. Very practical, in your face, real world consequences kind of impact. Excellent w

That was my first introduction to the notion of checksums and parity bits too. Very practical, in your face, real world consequences kind of impact. Excellent way to learn the concept. I don't miss having to type in all my software by hand, but the sort of forced physical learning and in-your-face impact of syntax and data patterns was really effective and something we should miss.