Bottom side of keyboard circuit board of Texas Instruments TI-nspire cx CAS calculator. To the left, one can see the board-to-board interconnect that connects to the main processing board. The ribbon cable connects to the touch pad. In the middle, one can see the battery connector. To the right, one can see the proprietary extension connector, which is found on the bottom of the calculator.
<a href="//commons.wikimedia.org/wiki/User:Selquim" title="User:Selquim">Selquim</a>
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