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The IBM 550 numerical interpreter was the first commercial machine made by IBM that read numerical data punched on cards and printed it across the top of each card. The 550 was introduced in 1930. Information to be printed could be placed in any sequence via plugboard control panel selections. The machine operated at the rate of 75 cards a minute. The feed hopper had a capacity of 800 cards, and the stacker had a capacity of 1,000 cards. Alphabetic and numberic characters could be printed by the Type 552 alphabetic interpreter, announced in 1937. It could process 60 cards per minute. The Type 552 was withdrawn in December 1957.〔(IBM Archives )〕 ==References== 〔 *http://www.columbia.edu/acis/history/interpreter.html 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「IBM 550」の詳細全文を読む スポンサード リンク
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