ocr: KEYPAD KEY - - - - - - - - - - - - * - J2 - - CONTACIS CONTACT PAD Beneath the keypad - is a circuit board with contacts for each key. Pressing a key closes a pair ofcontacts, telling the processing unit to store the binary code for that key - in the calculator's memory. The processing unit then sends the code to the display, where segments ofthe liquid crystal display darken to show the number.
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