实时操作系统VxWorks下的并口通信技术.pdf 文章描述了在实时探作系统VxWorks下利用并行打印机实现数据双向打印的方法，并给出了示例程序。-Under the VxWorks real-time operating system parallel port communication technology. Pdf article describes the VxWorks real-time detection system for the use of bi-direction