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How to make a calculator?

E

Erzhan

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How to make a calculator? Which is programmable, but only with logic gates

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You build a state machine out of logic using basic gates and LUTs.

Go to youtube.com and search with this phrase "calculator discrete logic"
 
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It sounds like this is related to an arithmetic logic unit, correct? The ALU 74181 is mentioned at Edaboard every once in a while. A forum search on 74181 turns up several threads about it.
It's also a circuit included in the menu of Falstad's animated interactive simulator. Schematic below. I suppose a hardware project requires adding keypad (diodes, switches) and 7-segment displays.

ALU 74181 schematic Falstad sim circuit.png
 
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