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Here is a list of pin-outs for the auxiliary or JAMMA + Plus buttons for each Mortal Kombat board.  MK 2 through 4 use exactly the same pins-outs and can connected together back to the control panel.  I had issues when connecting Mortal Kombat 1 with the remaining MK PCB's and a separate connector was used. 

 

 

 

Connect to J4 on PCB

 

Connect to P5 on PCB

Molex 12 Pin 0.100 Header

 

Molex 15 Pin 0.100 Header

 

Pin #

 

Button

 

 

 

Pin #

        

Button

1

n/c

 

1

n/c

2

n/c

 

2

n/c

3

n/c

 

3

n/c

4

1P Low Punch

 

4

n/c

5

n/c

 

5

n/c

6

n/c

 

6

n/c

7

1P Low Kick

 

7

1P Low Punch

8

n/c

 

8

1P Low Kick

9

2P Low Punch

 

9

n/c

10

2P Low Kick

 

10

n/c

11

n/c

 

11

2P Low Punch

12

n/c

 

12

2P Low Kick

 

 

 

13

n/c

 

 

 

14

n/c

 

 

 

15

n/c

 

 

 

 

Connect to 12 on PCB

 

Connect to P19 on PCB

Molex 15 Pin 0.100 Header

 

Molex 15 Pin 0.100 Header

 

Pin #

 

Button

 

 

Pin #

 

Button

1

n/c

 

1

n/c

2

n/c

 

2

n/c

3

n/c

 

3

n/c

4

n/c

 

4

n/c

5

n/c

 

5

n/c

6

n/c

 

6

n/c

7

1P Low Punch

 

7

1P Low Punch

8

1P Low Kick

 

8

1P Low Kick

9

1P Run

 

9

1P Run

10

n/c

 

10

n/c

11

2P Low Punch

 

11

2P Low Punch

12

2P Low Kick

 

12

2P Low Kick

13

2P Run

 

13

2P Run

14

n/c

 

14

n/c

15

n/c

 

 

 

15

n/c