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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.
+**Note:** The buttons below correspond to SNES buttons.  They should be replaced with weak/med/hard Punch + Kick references.
+{{ chips:ic-74157.png}}
+^ IC 1 ^^^^
+^ Pin ^ Function ^ Function ^ Pin ^
+|   1 |  DB9-8  |  DB9-5  | 16  |
+|   2 |  Right  |  GND  | 15  |
+|   3 |  Select  |  R Button  | 14  |
+|   4 |  DB9-4  |  Up  | 13  |
+|   5 |  Left  |  DB9-1  | 12  |
+|   6 |  X button  |  Down  | 11  |
+|   7 |  DB9-3  |  Y Button | 10  |
+|   8 |  GND  |  DB9-2  | 9  |
+** UNFINISHED! **