Questions tagged [punched-cards]

Punched cards were an early method of digital computer data storage, using cards made of stiff paper with holes punched in specific locations to represent data. They could be punched manually or automatically, were generally read automatically, and commonly held up to a few hundred bytes of data each.

Filter by
Sorted by
Tagged with
2
votes
3answers
359 views

What do the numbers on the punch cards mean?

Does anyone know what is the meaning of the numbers in punch cards? I need an example of any language, it's important for me to understand which information could be manipulated.
7
votes
3answers
319 views

Non-Computer Punch-Card Systems other than Edge-Notched Cards

Caveat: This is maybe a borderline for RC, as it's about systematic data processing even before (and in parallel to) computers. Before (and parallel to) computer and/or tabulating machine punch cards ...
36
votes
13answers
13k views

Why are punch card readers no longer in use?

When you think about it, punch cards are the safest way to backup data for long term storage. They are not influenced by magnetic fields and their data (the holes) don't fade over time. They are also ...
7
votes
5answers
557 views

How did a punchcard-based test-taking system work?

A punchcard (in 3 fragments) has been found in a copy of Computer Programming: A Mixed Language Approach by Marvin L. Stein and William D. Munro (1965). If my guess is right, a test-taker would write ...
12
votes
3answers
564 views

Which programming systems used object files on punch cards?

In a batch programming system developed in the late 1960s - early 1970s at the Joint Institute for Nuclear Research in the city of Dubna near Moscow, it was possible to dump object files to punch ...