#### shafin

##### Newbie level 2

Transfer

Increment

Addition

Add with Carry

Subtraction

Subtract with borrow

Decrement

OR

XOR

AND

NOT

I've got the Design from the Morris Mano book.But I need to reduce the number of gates to as small as possible.The design in the book uses 28 gates,counting the initial NOT gates.I succeeded in reducing it to 22 gates,but i've heard it has been implemented with lower number of gates.

Can you Help me,please?

Thanks in Advance.