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Wait for few seconds to stabilize all ICs. Press and hold keys for 1/2 seconds for display.
Push Button NO switches from top left to right Key 1, Key 2, Key 3. Bottom left Key 0 and bottom right Memory key. 2 digits Data from 00 to 33 could be entered by pressing keys. Input Data could be shifted to Memory by pressing Memory key. Memory Data remain unchanged until pressing Memory key again to send new Data to Memory. Every time present Data will be Added to Memory and show the result on LEDs. Green LEDs for unit place and Red LEDs for Ten place.
Keypad shift Register, Data accumulator Register and Memory Register build by D-Flip Flop. Data Register's Clock Pulse activate when Memory key pressed. At that time Data Register send Data to Memory Register. This way the model is running on.
Now Memory is showing 12, Input Data showing 23 and Red LEDs 011 (3) Green LEDs 101 (5). Now if you press Key 1, then Input Data will be 31, Memory 12 and Red LEDs 100, Green LEDs 011. But if you press Memory key then Memory will show 23, Input Data 23, Red LEDs 100, Green LEDs 110.
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