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This is all the PCB that hides inside a keyboard. Only 26 connectors are used to interface all 109 keys! Thanks to the matrices. What you probably have in front of you, is a keyboard with more than 100 keys on it... If you are not familiar with the key matrices, then you may think that inside this keyboard, there is a chip (probably a microcontroller) that has at least the same number of inputs to
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