6.The math coprocessor socket is rectangular. There is a notch at one end of the socket, as shown below.
notch
There is also a notch on one end of the math coprocessor:
notch
Align the notched side of the coprocessor with the notched side of its socket. The notched sides must be aligned for the coprocessor to operate properly, so be sure the alignment is correct before you proceed to the next step.
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