function of the program is to use the BIOS INT 14H, function, will be designated by the data from the serial port sent. In this process, procedures and ongoing testing communications circuits state Only in the "Send to maintain registers empty" the circumstances under which this under one character. The whole process is the main function MAIN () function and three SEND (), INIT (), LINETEST (). MAIN () is the entrance procedures and control data delivery; INIT () function to provide asynchronous serial communication initialization; SEND () function will be specified data sent out one by one; LINETEST () function to send data in the detection of pre-state communication lines. Use BIOS functions called serial asynchronous communication, it may state monitoring communications lines,

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串行异步通信文档.doc

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