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1. 发明授权

US4617564A Graphic display system with display line scan based other than power of 2 refresh memory based on power of 2 失效
标题翻译：图形显示系统，具有基于2的功率的2个刷新存储器的显示行扫描
公开(公告)号：US4617564A
公开(公告)日：1986-10-14
申请号：US542327
申请日：1983-10-17
申请人： Yoshikazu Yoshioka
发明人： Yoshikazu Yoshioka
IPC分类号： G09G5/00 , G06F3/153 , G06T11/00 , G09G5/18 , G09G5/32 , G09G5/34 , G09G5/395 , G09G1/02
CPC分类号： G09G5/395 , G09G5/346
摘要： A graphic display system using a cathode ray tube is disclosed, which display M line segments where M is based on an integer greater than 1 selected exclusively from integers not based on powers of 2 for each raster scanning line (line scan) in response to video data from a bit mapped refresh memory. The refresh memory is divided into memory blocks which are assigned sequential addresses and each store video dot data for one line segment. The memory is organized with N memory blocks for each scanning line, where N is an integer greater than M based on an integer selected from integers generated by powers of 2. The memory blocks are addressed with M blocks addressed during the display time and (N-M) blocks addressed during the remaining time of each line scan during which the CRT is blanked. The memory addressing rate is increased to complete the addressing of (N-M) blocks during the blanking time. This refresh memory addressing avoids complex memory block address calculation and also permits horizontal scrolling by the selection of a display start address.
摘要翻译：公开了一种使用阴极射线管的图形显示系统，其显示M个线段，其中M基于大于1的整数，其仅根据对于每个光栅扫描线（行扫描）的视频响应于视频而不是基于2的幂来选择来自位映射刷新存储器的数据。刷新存储器被划分为存储块，其被分配顺序地址，并且每个存储一个线段的视频点数据。存储器由每个扫描行的N个存储器块组成，其中N是大于M的整数，其基于从2的幂所产生的整数中选择的整数。存储器块在显示时间内被寻址的M个块（NM ）块在每行扫描的剩余时间期间寻址，其中CRT被消隐。增加存储器寻址速率以在消隐时间内完成（N-M）块的寻址。这种刷新存储器寻址避免了复杂的存储器块地址计算，并且还允许通过选择显示器起始地址的水平滚动。

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