4-Bit BCD Adder

2:4 decoder using NAND gates

1:4 Demux using NAND gaes

2:4 decoder using and gates

8:1 mux

XOR and XNOR by NAND gates

1:8 Demux

ALU

8:1 mux using AND OR

8:1 mux using NAND

Multiplexers using Gates

logicgates

3:8 decoder using AND gates

subtractors

4 Bit Shifter using gates

Halfadder

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3:8 decoder using NAND gates

4 bit adder subtractor

Common bus using tri-state buffer and decoder

Arithmetic and Logical unit(ALU)