IBM 96-column card

The IBM 96-column card was introduced in 1969 with the IBM System/3, and became fairly popular in the 1970s. While it had more columns than the 80-column IBM card, each column had only six punch positions (labeled, from the bottom up, 1, 2, 4, 8, A, and B) compared to the twelve positions of the 80-column cards, and punches were small and round; this allowed three rows of 32 columns to be fit on a 3 13/16" x 4 in. card. More efficient coding schemes were used here than on the 80-column cards, but it still allowed only for uppercase letters. The more compact cards could be used in places the older cards wouldn't fit, and turned up in such locations as tucked inside library books to note the due date, so that on checkin a card-reader could immediately note if it were overdue.