There used to be a magazine or book that had this one BASIC program that you had to type in really carefully. That program let you type in a bunch of hex characters with a CRC and would tell you if you typed a line wrong. The rest of the programs in the book while still just BASIC programs were printed all encoded as a bunch of hex digit lines. It was great, once you got it typed in you knew there weren't any typos. Then you could list or save or run it just like any other BASIC program.
