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Friden Flexowriter used as a console typewriter for the LGP-30 computer on display at the Computer History Museum Model 1 SPD (Systems Programatic Double-case) equipped for edge-punched cards; most Flexowriters had paper-tape readers and punches. The Friden Flexowriter was a teleprinter produced by the Friden Calculating Machine Company.
The tape punch, rather than punching out the usual round holes, would instead punch little U-shaped cuts in the paper, so that no chad would be produced; the "hole" was still filled with a little paper trap-door. By not fully punching out the hole, the printing on the paper remained intact and legible.
Three different international-standard two-hole punches. A hole punch, also known as hole puncher, or paper puncher, is an office tool that is used to create holes in sheets of paper, often for the purpose of collecting the sheets in a binder or folder (such collected sheets are called loose leaves).
The Model 33 was produced in three versions: [3] Model 33 ASR (Automatic Send and Receive), which has a built-in eight-hole punched tape reader and tape punch; Model 33 KSR (Keyboard Send and Receive), which lacks the paper tape reader and punch; Model 33 RO (Receive Only) which has neither a keyboard nor a reader/punch.
Hollerith's Keyboard Punch.This photo is staged; the keyboard layout is for the Farm card (leftmost column is labeled "Kind of Farm") of an Agricultural Census while the paper under the punch shows the layout of the 1890 Population Census card (the actual 1890 census cards had no printing). [6]
These cards (e.g., a JCL "JOB" card to start a new job) were often pre-punched 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 reading the cards in ...
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