Exercise 4 « Multiply by –2 in 4-bit two's complement → surprising simplifications! » (Only 8 valid values → b₀ always 0 → b₁ = a₀ → b₂ = a₁ ⊕ a₀ → very clever b₃) Circuit Link: https://circuitverse.org/simulator/edit/tut3ex4
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