Computer programming in the punched card era

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Student programmers at the Technische Hochschule in Aachen, Germany in 1970 use IBM 026 keypunches.
Punched card from a Fortran program.

From the invention of computer programming languages up to the mid-1970s, many if not most computer programmers created, edited and stored their programs line by line on punched cards. The practice was nearly universal with IBM computers in the era.

A punched card is a flexible write-once medium that encodes data, most commonly 80 characters. Groups or "decks" of cards form programs and collections of data. Users could create cards using a desk-sized keypunch with a typewriter-like keyboard. A typing error generally necessitated repunching an entire card. In some companies, programmers wrote information on special forms called coding sheets, taking care to distinguish the digit zero from the letter O, the digit one from the letter I, eight from B, two from Z, and so on. These forms were then converted to cards by keypunch operators, and in some cases, checked by verifiers. The editing of programs was facilitated by reorganizing the cards, and removing or replacing the lines that had changed; programs were backed up by duplicating the deck, or writing it to magnetic tape.

Work environment[edit]

A typical corporate or university computer installation would have a suite of rooms, with a large, access-restricted, air conditioned room for the computer (similar to today's server room) and a smaller adjacent room for submitting jobs. Nearby would be a room full of keypunch machines for programmer use. An IBM 407 Accounting Machine might be set up to allow newly created or edited programs to be listed (printed out on fan-fold paper) for proof reading. An IBM 519 might be provided to reproduce program decks for backup or to punch sequential numbers in columns 73-80. In such mainframe installations, known as closed shops, programmers submitted the program decks, often followed by data cards to be read by the program, to a person working behind a counter in the computer room. Many computer installations used cards with the opposite corner cut (sometimes no corner cut) as "job separators", so that an operator could stack several job decks in the card reader at the same time and be able to quickly separate the decks manually when he removed them from the stacker. These cards (e.g., a JCL "JOB" card to start a new job) were often prepunched in large quantities in advance.[1] This was especially useful when the main computer did not read the cards directly, but instead read their images from magnetic tape that was prepared offline by smaller computers such as the IBM 1401. After running a program, the computer operator would return the card deck and any hardcopy printed or punched output, typically to one of a set of alphabetically labelled cubby holes, based on the programmer's last initial. This was all batch-mode processing, as opposed to interactive processing.

Overnight and even 24x6-hour turnaround times were not uncommon. During peak times, it was common to stand in line waiting to submit a deck. However, on a lightly used system, it was possible to make alterations and rerun a program in less than an hour. Dedicated programmers might stay up well past midnight to get a few quick turnarounds. Use of this expensive equipment was often charged to a user's account. A mainframe computer could cost millions of dollars and usage was measured in seconds per job.

Smaller computers like the IBM 1000, 1620 and 1130, were less expensive and often run as an open shop, where programmers had use of the computer for a block of time. A keypunch was usually located nearby for quick corrections.

Identification and sequence[edit]

A single program deck, with individual subroutines marked. The markings show the effects of editing, as cards are replaced or reordered.

Many early programming languages, including Fortran, Cobol and the various IBM assembler languages, used only the first 72 columns of a card — a tradition that traces back to the IBM 711 card reader used on the IBM 704/709/7090/7094 series (especially the IBM 704, the first mass-produced computer with floating point arithmetic hardware), which could only read 72 of the 80 columns in one pass.

Columns 73-80 were ignored by the compilers and could be used for identification or a sequence number so that if the card deck was dropped it could be restored to its proper order using a card sorter. Depending on the programming language, debugging output statements could be quickly activated and "commented out" by using cards with such statements punched with the comment character (e.g., 'C' in Fortran) in column 80 of the card; turning the card end-for-end would put the 'C' in the leading column, which transformed the now backwards card's contents into a comment while leaving the physical card in place in deck.

(An alternative, imperfect but commonly employed technique to maintain proper card order was to draw one or more diagonal stripes across the top edge of all the cards in a deck.)

In later years, as punch card data was converted to magnetic tape files the sequence numbers were often used as a column in an array as an index value that can be correlated to time sequences, such as in the natural sciences where the data on the cards were related to the periodic output of a measuring device such as water stage level recorders for rivers and streams in hydrology, or temperatures in meteorology. Entire vaults full of card decks could be reduced to much smaller racks of nine-track tapes.

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