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Programmable for up to one logic function. Buttons on the left are used to "program" what logic sequence you want the combinational logic circuit on the right to respond to. Once push button is pressed, this sets it high, you can set it to any binary value up to 4 bits, and the output of the logic circuit on the right will only go high when the inputs below it are set to exactly the same sequence as what you programed. The blue LEDs show what binary value you set it to, and the green one just represents what the state the logic circuit on the right is. Once you "program" it, it will store that value; it can be reset by the logic switch below at the bottom left corner. While this circuit cannot be programed to accept more than one input, it still has many applications, such as... setting an alarm for your alarm clock because it has to sound the alarm for the time you programed it, or programing your coffee maker to brew automatically for you at a specific time in the morning, or you could even use it for a programmable pincode locking system, such as an electronic lock for your front door that can be programed to any costum pincode that you can easily remember.
Update: reset logic switch is now just a push button.
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