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+===== 74157 IC =====
+The 74157 is a quad 2-line to 1-line multiplexer. Basically how this works is there are two inputs ( A and B ) for every output ( Y ). There are four groups like this, with two inputs and one output. There is one select signal for the whole chip. When the select signal is low, the output ( Y ) is the same as input A. When the select signal is high, the output Y is the same as input B.
+{{ chips:ic-74157.png}}
+^ Pin ^ Function ^ Function ^ Pin ^
+|   1 |  Select  |  Vcc (+5v)  | 16  |
+|   2 |  1A  |  Enable (GND)  | 15  |
+|   3 |  1B  |  4A  | 14  |
+|   4 |  1Y  |  4B  | 13  |
+|   5 |  2A  |  4Y  | 12  |
+|   6 |  2B  |  3A  | 11  |
+|   7 |  2Y  |  3B  | 10  |
+|   8 |  GND  |  3Y  | 9  |