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The IBM 5520 ''Administrative System'' was a text and data processing system, announced by IBM General Systems Division (GSD) in 1979.〔IBM history (article about 5520 )〕 The system offered linked text-editing work stations that shared a storage unit a central processor unit, CRT-based display stations (IBM 5253 and 5254), a daisy wheel printer (IBM 5257) and an ink jet printer (IBM 5258). Depending on the model, from one to 18 display stations and from three to 12 printers could be attached. Other systems, i.e. 6670 Information Distributor, Office System/6, 6240 Mag Card Typewriter-Communicating and System/370 could be connected for electronic document distribution. While the Office System/6 introduced two years earlier by IBM Office Products Division (OPD) was focused on word processing, the new 5520 intended to complement existing products lines with text editing and data processing power. The need for action became urgent because IBM was losing market share〔Business Week 19.Nov.1979 "lost 20% of this fast-growing market"〕 to companies such as Wang who exploited display (size), storage (magnetic cards), and computing (performance) weaknesses of IBM's established product lines by aggressive marketing, including direct comparisons.〔ads e.g. in Cincinnati Magazine November, 1977 pg.9〕 == See also == * Wang WPS and OIS 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 5520」の詳細全文を読む スポンサード リンク
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