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专利名称：Method for operating a computing system
to write text characters onto a graphicsdisplay
发明人：Bradley, David John申请号：EP821057.3申请日：19820629公开号：EP0071744B1公开日：19880518
摘要：Method and system for writing text characters to a raster scan video display(50, 51) operated in an all-points- addressable, or graphics mode, and for readingcharacters thus written. A graphic video display buffer (34) directly refreshes the display(50) with graphics data received from a microprogrammed processor (20). The processor(20) writes a character to the display (50) by selecting and loading into the graphics videodisplay buffer (34) a text character dot pattern retrieved from main storage (25, 27), andexpanded to a selected pixel and color format, and reads a character previously writtenby comparing a dot pattern retrieved from the display buffer (34) with dot patternretrieved from main storage (25, 27).
申请人：INTERNATIONAL BUSINESS MACHINES CORPORATION
代理机构：Bonneau, Gérard
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