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digital logic - Why is the output to this 74181 ALU circuit always on? - Electrical Engineering Stack Exchange
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74 series digital circuit 74181, 74LS181 arithmetic logic units/function generators - Signal_Processing - Circuit Diagram - SeekIC.com
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digital logic - What is the True Pinout and Function of the 74ls181 in both of its modes (Active High and Active Low)? - Electrical Engineering Stack Exchange
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