The invention provides a semiconductor memory device capable of performing a memory function test without using an expensive tester. The layer is patterned to align the source with the gate using photoresist and back illumination through the substrate with the gate acting as a mask. The plurality of iron type golf clubs also have lengths which are linearly spaced such that a first iron type golf club has a length which is y inches less than the length of the second iron type golf club and the second iron type golf club has a length which is y inches less than the length of the third iron type golf club and subsequent iron type golf clubs decrease in length at the same rate.