DOS下遍历PCI设备程序。

这有3个独立的工程，分别采用bios方式和io端口方式对pci设备遍历。

工程是在windows下用Borland C++5.0生成，其中xxx.exe文件可以直接在dos下运行。-Traverse the PCI devices under DOS programs. There are three separate projects, respectively bios mode and manner io port pci device traversal. Project is under the windows generated by Borland C++5.0, which can be directly xxx.exe file to run in dos.