Printer Port Software Key

I need help finding how to build a printer port software key, where my software can only be used when this printer port adapter is plugged in.


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  • : I need help finding how to build a printer port software key, where my software can only be used when this printer port adapter is plugged in.

    :

    It is very easy. Check the port Address 278H or 378H as base Address (IBM compatible). Set bit C5

    to logic 1. Conectto GND or leave open each bit D0..D7 and S3 to S7 ( totally 13 bit). Your Program can read this combination and compare with a constant. If not Equal, halt the program



    Have fun.


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