一、概述在计算机的发展中,输入输出设备的作用虽然不如中央处理设备那样引人注目,但是它却是一个与用户接触最多的设备,它的性能好坏对系统的使用有着很大影响,因此,随着数据处理技术的发展,用户更加关注输入输出设备,并且不断地提出各种新的要求。对于行式打印机控制器的设计就是如此。在保证印刷质量的前提下,不但要求进一步提高打印速度,而且还要求增强其操作功能,改善调试、维护性能等。以往,国内外的打印机控制器一般都是采用硬连逻辑控制。这种逻辑结构不规则,各逻辑部件之间相互关系密切,不仅设计困难,而且调整、维护麻烦。尤其是一旦设计、制造完成之后,就不易修改。因此,这种控制器功能 I. Overview In the development of the computer, although the role of input and output devices is not as compelling as the central processing equipment, but it is a device with the most contact with users, its performance is good or bad has a significant impact on the use of the system, Therefore, with the development of data processing technology, users pay more attention to input and output devices, and continuously make various new requirements. This is true for line printer controllers. In ensuring the printing quality under the premise, not only requires further increase the printing speed, but also requires the enhancement of its operating functions, improve debugging, maintenance performance. In the past, domestic and foreign printer controllers are generally hard-wired logic control. This kind of logical structure is irregular, and all the logic components are closely related to each other, not only designing difficulties, but also adjusting and maintaining the troubles. Especially once the design, manufacture is completed, it is not easy to modify. Therefore, this controller function