@jonathankoren@sfba.social Fortran IV used columns 1-5 for statement labels (numeric only), which could be used by GOTOs; 6 was continuation; 7-72 was program text (blanks were not significant); 73-80 could be used for anything but typically was sequence numbers (in intervals of 100, to allow insertions) for putting things back together after spilling the cards on the floor. The cards wore out gradually over time, at which point they were put through a duplicating punch that also resequenced the cards. @timbray@cosocial.ca