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Q. 6.9: Two ways for implementing a serial adder (A + B) is shown in Section 6.2. It is necessary to modify the circuits to convert them to serial subtractors (A - B).
(a) Using the circuit of Fig. 6.5, show the changes needed to perform A + 2’s complement of B.
(b) Using the circuit of Fig. 6.6, show the changes needed by modifying Table 6.2 from an adder to a subtractor circuit.
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Problem solutions of the book Digital Design by Morris Mano and Michael Ciletti:    • Q. 6.1: Include a 2‐input NAND gate in the...  
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