I remember working with a guy who had programmed in FORTRAN in the days of punch cards. He said he once dropped the stack of cards and had to reconstruct the order. He always numbered the cards after that.
Apparently, programmers would 'unpunch' a hole in a card by taping some paper back in the hole to save repunching a new card! And sometimes these 'chads' would fall out, making for some interesting debugging.
Apparently, programmers would 'unpunch' a hole in a card by taping some paper back in the hole to save repunching a new card! And sometimes these 'chads' would fall out, making for some interesting debugging.