4-Bit BCD Adder

4 bit adder

4 Bit Adder-Subtractor

Full Adder

Flip Flops

Flip Flops

Flip Flops

Half Subtractor Circuit

Full Subtractor

4 Bit Adder

4 Bit Adder

4 Bit Adder-Subtractor

4 Bit BCD Adder

Full Subtractor

4 Bit BCD Adder

4 Bit Adder-Subtractor

4 Bit Adder

Buffers

SISO

Counters

1 bit adder

1 bit adder

1 bit adder

4-Bit BCD Adder

Flip Flops

4 Bit Adder

4 Bit Adder-Subtractor

Common bus using multiplexers

Half Subtractor Circuit

4 BIT ALU