chips:74157
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— | chips:74157 [2005/11/15 21:45] – nfg | ||
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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. | ||
+ | |||
+ | {{ chips: | ||
+ | ^ IC 1 ^^^^ | ||
+ | ^ Pin ^ Function ^ Function ^ Pin ^ | ||
+ | | 1 | DB9-8 | DB9-5 | 16 | | ||
+ | | 2 | Right | GND | 15 | | ||
+ | | 3 | Select | ||
+ | | 4 | DB9-4 | Up | 13 | | ||
+ | | 5 | Left | DB9-1 | 12 | | ||
+ | | 6 | X button | ||
+ | | 7 | DB9-3 | Y Button | 10 | | ||
+ | | 8 | GND | DB9-2 | 9 | | ||
+ | |||
+ | ** UNFINISHED! ** |
chips/74157.txt · Last modified: 2019/08/27 20:45 by 127.0.0.1