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HILINE

                                                                               

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 COMPARISON OF SERIAL & PARALLEL DEVICES
    A serial device transfers data 1 bit at a time in a serial fashion.  
    Data transfer from a serial ports is relatively slow, transmitting 
    from 300-19200 bytes per second.
Data transfer from
a serial device:

                             

                         POINT A                    POINT B
                                    

                         POINT A                    POINT B
                                           

                         POINT A                    POINT B
                                                   

                         POINT A                    POINT B
                                                           

                         POINT A                    POINT B
                                                                 

                         POINT A                    POINT B
                                                                 

                         POINT A                    POINT B
                                                                 

                         POINT A                    POINT B
 COMPARISON OF SERIAL & PARALLEL DEVICES
    A parallel device sends several bits of data at a time, in parallel.  
    Data transfer from parallel ports is significantly faster than from 
    serial ports, up to 50 kilobytes of information per second.
Data transfer from        
a parallel device:                
                             

                             

                             

                             

                             

                       POINT A
Data transfer from                                        
a parallel device:                
                                                             

                                                             

                                                             

                                                             

                                                             

                                                       POINT B