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by Moru 859 days ago
In the 90-ies I was told to figure out what was wrong with the big radiocontrolled port at a local industry. I don't remember what was wrong with it but after digging in the manual and the equipment I realized the whole factory was protected by a four bit code set with dip-switches on a circuit board. I guess it was supposed to be used to select what port to open with the remote but was all that was stopping anyone to open the door at all.