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• It could read a punched card from a deck, do some calculations based on the wiring of its plugboard, and punch results onto the same card.
• The Remington Rand 409, a punched card calculator which was programmed with a plugboard, was designed in 1949.
• This scheme, like the earlier "card catalog," was independent of the number of connections being used in the Enigma's plugboard, or commutator.
• The Enigmas with the plugboard (Steckerbrett) were considered secure if used according to the instructions, but were less secure if stereotyped beginnings or routine phrases were used, or during the period of what they described as the "faulty indicator technique" - used up until May 1940.
• The card-programmed calculators used fields on punched cards not to specify the actual operations to be performed on data, but which "microprogram" hard-coded onto the plugboard of the IBM 604 or 605 calculator machine; a set of cards produced different results when used with different plugboards.
• The 2300 series were cosmetically similar to the 2200 series, although without the function keys or numeric keypad, with a simplified plugboard, and operating at 145 words per minute (12 characters per second).
• The Germans did not have time to destroy all their cryptographic documents, and the captured material revealed the precise form of the indicating system, supplied the plugboard connections and Grundstellung for 23 and 24 April and the operators' log, which gave a long stretch of paired plaintext and enciphered message for the 25th and 26th.
• Programs for the TRADIC Phase One Computer were introduced via a removable plugboard, while the Flyable TRADIC used a Mylar sheet with punched holes — a system reminiscent of punched-card storage.
• He was working alongside David Rees, another Cambridge mathematician recruited by Welchman, in nearby Elmers School, testing candidate solutions and working out plugboard settings.

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