Thread:GD-2 Predator/@comment-34819558-20180903162758/@comment-34929636-20180909030649

That is a punch card. They were the first major method of storing large amounts of information. Notice the holes and how they correspond to numbers?

A special feed mechanism would read those holes and translate them into either instructions or data, depending on what the computer was set to accept.

You actually have probably seen one of these and never noticed. This same technology, which dates back to about 1910, is used to grade Scantrons and other bubble tests.