Arithmetic Logic Unit

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A detailed look at a simple ALU and how it works.

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Twin 5ohm MUX4 passes any Karnaugh map, also Manchester Carry.
Why do we need a Ripple Carry adder in front to slow it down?
Why do we need discreet gates in front to limit our logic choice?
74CBT3253 fits well with 74LVC2G86 on an SSOP to DIP28 PCB.
XOR B to subtract. XOR Karnaugh vs prior carry for full result.
Pull Generate low to disable arithmetic for pure logic.
Pull Annihilate high to reverse subtraction.

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It was GREAT!
Helped me a lot
Thank you

RealStalin