yep, I had to know the Holerath (sp) code to use one of the card punch machines we had in high school (mid 70's) and be able to read a card for a test. program in Cobol and Fortran IV. We even had this HUGE beastie of a printer that you had to use jack plugs to program it what to print. The DP room was on the second floor of the vocational building and when it would print the beastie would shake the building. The home-ec teacher would come up and crab because the shaking caused some cakes to fall. LOL (true story)