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The command, parallelput sends binary information to the parallel port on a PC. The command appears in a number of different computer programming languages such as C/C++ and Delphi but may have equivalents in other languages.
It's worth noting that most modern PC clone computers don't have a parallel port anymore. On older machines it was used to drive the printer and was noticable by its large 25 way D connector and flat ribbon cable. The data lines of a parallel port are 8 bit (0-255) and labelled DB0 through DB7.
In C the command is parallelput (value) where the value is the 8 bit binary value to be sent to the parallel (print) connector. Therefore the command in parallelput (3) would send the binary 00000011 to the parallel port which would in turn switch on DB0 and DB1 on the port.
The parallel port is bidirectional and thus can receive information too using the parallelget command.
Chris Neary Bsc hons FdSc
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