Null Printer Adapter

  
This circuit is a simple adapter for PC parallel port to think that there is a printer connected to computer. This adapter is useful for testing printing speed with different software and as a part of your own designs. You can use this circuit to connect your simple circuits to the parallel port. Usually many home-made circuits use parallel port in a way which you have to use direct I/O commands to control the parallel port to be able to communicate to your circuit.
Null Printer Adapter - schematic

Unfortunately this approach is not always possible, because some operating system prohibit the programs to directly control the computer hardware. In this situation you might want to use standard operating system printer printing functions for sending dat



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