Dos下使用串口实现先进先出,支持COM1-COM4-　　　　　　16550 is a shareware program designed to allow the　unlocking

　　　　　of the internal fifo buffer present in the UART chip of the same

　　　　　name. The program will scan all four COM ports (COM1:- COM4:)

　　　　　available on the PC and report the presence (if any...) of the

　　　　　16550 UART. The user may optionally set the various parameters

　　　　　necessary to utilize this buffered mode of operation.