Jag Adapter Pt4 CV Encoder


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jag_adap4

What a rat's nest



PARTS LIST:

(3) CD4016 or CD4066 4-Channel Analog Switch ICs
(4) 74LS30 8-input Nand gate ICs
(10) silicon diodes
(1) dsub9 connector
(1) genesis or dsub9 extension cable
(1) cable and connector to tap out 5v and gnd


CIRCUIT:                         
                                        
           5v---------cv_5v            gnd------------cv_gnd

                  5v                                  5v                        
            ______|______                       ______|______                 
           |     VCC     |                     |     VCC     |               
/J_north---|1EN        1X|--|<--cv_p_1   /J_B--|1EN        1X|--|<--cv_p_6  
           |           1Y|------cv_p_8         |           1Y|------cv_p_8 
           |             |                     |             |           
/J_south---|2EN        2X|--|<--cv_p_2   /J_A--|2EN        2X|--|<--cv_p_6 
           |    4016   2Y|------cv_p_8         |    4016   2Y|------cv_p_5
           |    4066     |                     |    4066     |                  
/J_west----|3EN        3X|--|<--cv_p_3    gnd--|3EN        3X|
           |           3Y|------cv_p_8         |           3Y|
           |             |                     |             |               
/J_east----|4EN        4X|--|<--cv_p_4    gnd--|4EN        4X|
           |     GND   4Y|------cv_p_8         |     GND   4Y|
           |_____________|                     |_____________|            
                  |                                   |                 
                 gnd                                 gnd               

                  5v                                  5v                        
            ______|______                       ______|______                 
           |     VCC     |                     |     VCC     |               
       5v--|A           Y|---------------------|1EN        1X|--|<--cv_p_1  
      J_3--|B            |                     |           1Y|------cv_p_5 
      J_4--|C            |                     |             |           
      J_6--|D            |   ,-----------------|2EN        2X|--|<--cv_p_2 
      J_0--|E   7430     |   |                 |    4016   2Y|------cv_p_5
      J_#--|F            |   |                 |    4066     |                  
 J_Option--|G            |   |     ,-----------|3EN        3X|--|<--cv_p_3
      J_C--|H            |   |     |           |           3Y|------cv_p_5
           |     GND     |   |     |           |             |               
           |_____________|   |     |        ,--|4EN        4X|--|<--cv_p_4
                  |          |     |        |  |     GND   4Y|------cv_p_5
                 gnd         |     |        |  |_____________|            
                             |     |        |         |                 
                             |     |        |        gnd               
                             |     |        |_____________________,
                             |     |                              |
                  5v         |     |                  5v          |             
            ______|______    |     |            ______|______     |           
           |     VCC     |   |     |           |     VCC     |    |          
       5v--|A           Y|---'     |       5v--|A           Y|----' 
      J_4--|B            |         |      J_1--|B            |
      J_5--|C            |         |      J_3--|C            |           
      J_8--|D            |         |      J_7--|D            |
      J_9--|E   7430     |         |      J_8--|E   7430     |
      J_*--|F            |         |      J_*--|F            |                  
      J_0--|G            |         | J_Option--|G            |
 J_Option--|H            |         |      J_C--|H            |
           |     GND     |         |           |     GND     |               
           |_____________|         |           |_____________|
                  |                |                  |
                 gnd               |                 gnd
                                   | 
                  5v               |        
            ______|______          |       
           |     VCC     |         |      
       5v--|A           Y|---------'     
      J_2--|B            |              
      J_4--|C            |             
      J_5--|D            |            
      J_7--|E   7430     |           
      J_8--|F            |          
      J_#--|G            |         
      J_C--|H            |        
           |     GND     |       
           |_____________|      
                  |            
                 gnd          

HOW IT WORKS:

Whole lotta "Coleco were chowderheads for not using a 15-pin connector" going on. :(

Hey, I didn't design this controller scheme, and actual cv controllers are a mess too. As Deathskull says, they use a "swamp of diodes". In fact I had to redo this circuit, the first version had too much diode loading on the flip-flops. Take note that both the inverting and non-inverting flop signals are used.

Neither ground nor 5v is brought out to the connector, so you'll have to tap it out another way.

Ken Uston Blackjack/Poker is a good game for verifying the keypad. You need to get the "1" button working first.

The "option" and "C" buttons act like the purple and blue buttons on the super action controller. The rest of the circuit works by..... ah hell, you can figure it out. I gotta go lie down for awhile.

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