a slot pinhole dual layout is made of multi - rows of pinholes to perform selective electro - connection between two different interfaces , including a first pinhole layout and a second pinhole layout . the first pinhole layout is formed by four rows of pinholes , including first and second pinhole rows . the second pinhole layout is formed by another four rows of pinholes , including third and fourth pinhole rows . while the third and the fourth pinhole rows are shifted a proper distance , the first and the second pinhole rows would be interlaced , which enables the present invention to increase the compatibility between diverse extension slots .