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chips:74157 [2005/11/15 21:45] nfgchips:74157 [2019/08/27 20:45] (current) – external edit 127.0.0.1
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 ===== 74157 IC ===== ===== 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.+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 each. 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:74157.gif?nocache }}
- +
-{{ chips:ic-74157.png}}+
 ^ IC 1 ^^^^ ^ IC 1 ^^^^
 ^ Pin ^ Function ^ Function ^ Pin ^ ^ Pin ^ Function ^ Function ^ Pin ^
-  1 |  DB9-8  |  DB9-5  | 16  + 1 | Select  |  Vcc | 16 | 
-  2 |  Right  |  GND  | 15  + 2 | 1A  |  CE | 15 |  
-  3 |  Select  |  R Button  | 14  + 3 | 1B  |  4A | 14 |  
-  4 |  DB9-4  |  Up  | 13  + 4 | 1Y  |  4B | 13 |  
-  5 |  Left  |  DB9-1  | 12  + 5 | 2A  |  4Y | 12 |  
-  6 |  X button  |  Down  | 11  + 6 | 2B  |  3A | 11 |  
-  7 |  DB9-3  |  Y Button | 10  + 7 | 2Y  |  3B | 10 |  
-  8 |  GND  |  DB9-  + 8 | Gnd   3Y  |  
 + 
 +==== Uses ==== 
 +  * [[controls:megadrive_genesis_controller_3|Genesis/MD 3-button controller]] 
 +  * [[controls:pc_engine_controller|PC Engine/TurboGrafx 16 controller]] 
 +  * [[http://www.gamesx.com/importmod/sat_switchless.htm|Saturn switchless import mod]] 
  
-** UNFINISHED! ** 
chips/74157.1132055122.txt.gz · Last modified: 2019/08/27 20:44 (external edit)