IBM 1403

The IBM 1403 line printer was introduced as part of the IBM 1401 computer in 1959 and had an especially long life in the IBM product line. The original model could print 600 lines of text per minute and could skip blank lines at up to 75 inches/second. The standard model had 120 print positions. An additional 12 positions were available as an option. A print chain with at least five copies of the character set spun horizontally in front of the ribbon and paper. Hammers struck the paper from behind at exactly the right moment to print a character as it went by. In later models, the print chain was replaced by a print train; print slugs instead of being mounted on a chain were placed in a track.

The standard 1403 chain or train could print 48 different characters: 26 letters, 10 digits, and 12 special characters: & , . - $ * / % # @ ≠ ⌑. Special chains or trains could be ordered for other character sets. Scientific users, for example, would use a chain that had the left parenthesis, the right parenthesis, and the plus sign in place of the per cent sign (%), the lozenge (⌑) [The "lozenge" is the square lozenge (U+2311) that resembles an overstuffed pillow, not the diamond-shaped one. Some Unicode typefaces do not render it correctly.] , and the ampersand (&). The numerics chain had more copies of fewer characters.

The ink ribbon was a long roll the width of the print area that was positioned between the print chain and the paper. The roll came in two parts, the feeder roll and take-up roll. The roll was constantly wound and rewound during printing.

Like most IBM printers of the era, the 1403 used fan-folded paper with perforated edges for tractor feeding. A carriage-control tape or, later, a buffer, under program control [this was system dependent] , specified form length and the form line where printing was to begin so that paper of various sizes could be used.

An IBM 1403 printer played a cameo role in Stanley Kubrick's 1964 movie Dr. Strangelove, serving as a hiding place for a portable radio.

The overstrike capability of the printer was used to generate a wide range of grey-scale equivalents. Many images were scanned, pixelated and could be reproduced on the 1403, most notably the Mona Lisa. [MacLeod, I.D.G., [http://ieeexplore.ieee.org/iel5/12/35043/01671476.pdf?tp=&isnumber=35043&arnumber=1671476 "Pictorial Output with a Line Printer"] , "IEEE Transactions on Computers", February 1970, pp.160-162.] [Perry, Benson, Mendelsohn, Mortimer L., [http://portal.acm.org/citation.cfm?id=364336&dl=GUIDE&coll=GUIDE "Picture Generation with a Standard Line Printer"] , "Communications of the ACM", v.7, pp.311-313, May 1964 ]

These were huge and noisy machines, especially when the cover was raised. See the link below to learnhow some people were able to use the timing of the print hammers to generate desired frequencies andactually play music.

Notes

External links

*cite book
title = IBM 1403 Printer Component Description
id = GA24-3073-8
last = IBM
date = October, 1972
url = http://www.bitsavers.org/pdf/ibm/14xx/GA24-3073-8_1403_printer.pdf
*1403-generated music [http://staging.computerhistory.org/exhibits/highlights/] at the Computer History Museum

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