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The GSI C/A/T (Computer Assisted Typesetter) is a phototypesetter developed by Graphic Systems in 1972. This phototypesetter, along with troff software for UNIX, revolutionized the typesetting and document printing industry. Phototypesetting is most often used with offset printing technology. The ''GSI C/A/T'' phototypesetter was marketed by Singer Corporation in 1974 before the company was purchased by Wang Laboratories in 1978. Graphic Systems designed a simple computer front-end to print basic text as display type. Full scale page composition computing was designed at Bell Laboratories as part of the UNIX project. == Features == The C/A/T phototypesetter has the following features: * Punched paper tape for document input * Four font film strips with 102 characters or glyphs per strip * Canisters of photographic paper or film to receive the image * Fifteen distinct font sizes (5pt to 72pt) * Horizontal positioning precision of 432 units per inch * Vertical positioning precision of 144 units per inch C/A/T optics consist of a rotating wheel to which are attached film strips of master font characters. The wheel's periphery has four such replaceable font film strip sections. A xenon strobe inside the wheel is programmed to flash the characters from the font films through magnification optics to a fiber-optic bundle. The programmable location of the fiber-optic bundle determines the horizontal position of the character image on a scroll of photographic paper or film. C/A/T is a highly addressable phototypesetter with full optics control from computer-generated data. This precise control of optics and image position made the interface to computer programs reasonably simple. Data is normally transmitted to the C/A/T by paper tape. Some companies created electronic replacements for the paper tape interface to accommodate direct connection to computer systems. C/A/T has no page layout and pagination capability. It is only a high resolution printer that puts high-resolution character images onto a photographic media. Page layout is determined by the typesetting software used to generate the paper tape. 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「CAT (phototypesetter)」の詳細全文を読む スポンサード リンク
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