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Some Computer Hardware Devices  

ADDER:- Adder is a combinational Circuit use which is use to add bits. In computer we use two types of adder:

1)  Half Adder

2)  Full Adder

Half Adder:- The half adder adds two single binary digits A and B. It has two outputs, sum (S) and carry (C). The carry signal represents an overflow into the next digit of a multi-digit addition. The value of the sum is 2C + S. The simplest half-adder design, pictured on the right, incorporates an XOR gate for S and an AND gate for C. With the addition of an OR gate to combine their carry outputs, two half adders can be combined to make a full adder.


Full Adder:- A full adder adds binary numbers and accounts for values carried in as well as out. A one-bit full adder adds three one-bit numbers, often written as A, B, and Cin; A and B are the operands, and Cin is a bit carried in from the next less significant stage The full-adder is usually a component in a cascade of adders, which add 8, 16, 32, etc. binary numbers. The circuit produces a two-bit output sum typically represented by the signals Cout and S, where \mathrm{sum} = 2 \times C_{out} + S. The one-bit full adder's truth tableis:


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