利用WINIO在Windows2000下对研华的数据采集卡PCL－812PG进行直接端口操作，运行正常，但实时性有待改善。-use WINIO in Windows2000 China Institute of the data acquisition card PCL-812PG direct port operations, operating normally, but the real-time needs to be improved.

有多种方法可以实现异步I/O，其不同资料上的分类一般都不尽相同，但原理上都类似，这里我把实现异步I/O的方法分为3类，本文就针对这3类方法进行详细的讨论。 （1）重叠I/O （2）异步过程调用（APC），扩展I/O （3）使用完成端口（IOCP） -There are many ways to achieve asynchronous I/O, its information on the different classifications in general are not

get the value from IOport like 8042 -get the value from IOport like 8042 ...

单片机的双机并行通信例程，可以实现双击的双向并行通信，通信稳定可靠-Single-chip parallel communication routines, two-way parallel communication can achieve double, stable and reliable communication