DOS下的有8254时钟的程序，他能改变RTC中断IRQ8的响应时间将定时为1MS-DOS under the 8254 clock procedures He interrupted IRQ8 RTC can change the response time will be a time for MS

一些关于微处理器的器件手册，包括了8237，8251，8255，8259，16550，8254等，适于对微机接口的深入学习使用。

电子琴的设计，这是微机接口设计中要用到的。8254，8255等，文档，程序都有了-flower design, which is Computer Interface Design to the use. 8254,8255, files, programs have the