可通过并口任意针脚输出1-5000MHZ正弦波。-Through the parallel port pin-out 1-5000MHZ any sine wave.

This a good tutorial about interfacing with the parallel port more inportantly reading from the port. Other articles I ve seen only shown how to write to the port. Before I get ahead of myself, the parallel port I used is an ECP (Extended Capabi