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众所周知,在光栅扫描式图形显示器中,存储重显信息的显示RAM和计算机中存储信息的系统RAM二者工作方式不同,后者如果不是动态RAM,则只要它不与CPU交换信息便无读写操作。而前者在不与CPU交换信息时,图形显示器要不断地对显示RAM进行读出,以便重显其中的存储信息。动态存储器作显示RAM,其功耗较低,价格便宜,集成度高,但显示器在对它进行重显读出的同时,还要进行刷新操作。在刷新期间必须暂停CPU与它交
It is well-known that in raster-scan graphic displays, the display RAM storing the re-display information and the system RAM storing the information in the computer both work in different ways, and the latter, if not dynamic RAM, have no read-write operating. The former does not exchange information with the CPU, the graphics display to continue to read the display RAM in order to re-display the stored information. Dynamic memory for display RAM, its low power consumption, low price, high integration, but the display in its heavy read out, but also for refresh operation. The CPU must be suspended during refresh