激光照排机驱动程序设计

The Driver Design for the Control Interface of a Laser typersetter

在介绍激光照排机工作原理、激光照排机控制接口电路的基础上，详细介绍了磁盘中的图形文件数据的读取方法、图形文件的表示形式及位图文件的分段存取和输出方法。既解决了输出数据量大与存贮空间小的矛盾，又解决了输出速度快与磁盘存取速度慢的矛盾，实现了整幅位图数据文件连续读取、分段传送、多级缓冲、激光照排机连续输出多幅图形的功能。

Based on having analyzed the working principle and the control interface circuits of the laser typersetter, this paper described methods for the graphical data storage and the representation, and methods for a bitmap segmenting and output. By using these methods, problems such as speed dismatch between a computer and a laser typersetter, contrariness between small memory and large amount of graphical dada were solved. Therefore, we can read data from files continuously and deliver data by segmenting. As a result, images can be printed in the laser typersetter without lossing fidelity.