=====SNK Super Neo 29 Candy Pinouts====
I don't know if or how many of these connectors are the same on other SNK cabinets, but straight out of the manual, here's the list for this cab.

=== Pins, Tabs, Plugs & Sockets ===
All the connectors used in this cabinet are made by JST, but they come from two families: YL and VL.

**Note:** Both the YL and VL series //plug// is uses a //socket// inner connector.  The receptacle, mounted to the device, uses a //pin// inner connector.  This nomenclature is sort of backwards to what you might expect.

^  YL Series Connectors  ^^^^
^  Function  ^  Pins  ^  Plug  ^  Socket  ^
^  Start Buttons |  6  |  YLP-06V  |  YLR-06V  | 
^  Primary Controls |  12  |  YLP-12V  |  YLR-12V  |
^  Service Test SW |  8  |  YLP-08V  |  YLR-08V  |
^  Coin Selector |  6  |  YLP-06V  |  YLR-06V  |
^  YL Series Connectors  ^^  ↓  ^  ↓  ^
|  ^^  Socket  ^  Pin  ^
^  26-20 AWG ||  SYF-01T-P0.5A  |  SYM-01T-P0.5A  |
^  20-16 AWG ||  SYF-41T-P0.5A  |  SYM-41T-P0.5A  |

^  VL Series Connectors  ^^^^
^  Function  ^  Pins  ^  Plug  ^  Socket  ^
^  AC Input |  6  |  VLP-06V  |  B06P-VL  |
^  DC Output |  8  |  VLP-08V  |  B08P-VL  |
^  FL Unit |  3  |  VLP-03V  |  B03P-VL  |
^  Degauss |  2  |  VLP-02V  |  B02P-VL  |
^  VL Series Connectors  ^^  ↓  ^  ↓  ^
|  ^^  Socket  ^  Pin  ^
^  22-16 AWG ||  SVF-42T-P2.0  |  SVM-42T-P2.0  |
^  20-14 AWG ||  SVF-61T-P2.0  |  SVM-61T-P2.0  |


The VL series come in two styles, inner- and outer-housing lock.  This refers to the clasp that holes the plug to the socket, preventing inadvertent removal.  The inner style is what's normally used on arcade machines. 

===== Control Input =====

==== Start Buttons ====
For whatever reason, the 1- and 2-player Start buttons aren't on the main controller connector.

{{:arcade:ylp-06v.png | }} 
^ Pin ^ Function ^ Pin ^ Function ^
|  1  | P1 Start |  4  | P2 Start |
|  2  | Ground |  5  | Ground |
|  3  | N/C |  6  | Frame Ground |

==== Primary Controls ====
The pinouts for P1 and P2 are the same.  P2 has a red socket in the cabinet.

{{:arcade:ylp-12v.png | }}
^ Pin ^ Function ^ Pin ^ Function ^ Pin ^ Function ^
|  1  | Up|  5  | Button 1 |  9  | N/C  |
|  2  | Down |  6  | Button 2 |  10  | N/C |
|  3  | Left |  7  | Button 3 |  11  | Ground |
|  4  | Right |  8  | Button 4 |  12  | N/C | 

===== Service, Test & Counter =====
This connector provides the service and test buttons, and connects the JAMMA harness to the coin counter.

{{:arcade:ylp-08v.png | }}
^ Pin ^ Function ^ Pin ^ Function ^
|  1  | Service |  5  | N/C |
|  2  | Test |  6  | N/C |
|  3  | Coin 1 (to JAMMA)  |  7  | +12V |
|  4  | Coin Counter 1 (To JAMMA)  |  8  | Coin Counter 1 (To Counter)  |

===== Coin Selector =====
This is input from the coin mechanism.

{{:arcade:ylp-06v.png | }} 
^ Pin ^ Function ^ Pin ^ Function ^
|  1  | Coin 1 |  4  | N/C |
|  2  | Ground |  5  | N/C |
|  3  | N/C |  6  | Frame Ground |

===== DC Output =====
{{:arcade:vlp-08v.png | }}
^ Pin ^ Function ^ Pin ^ Function ^
|  1  | +5V |  5  | +12V |
|  2  | +5V |  6  | -5V |
|  3  | Ground  |  7  | N/C |
|  4  | Ground  |  8  | Frame Ground  |

===== AC Input =====
{{:arcade:vlp-06v.png | }}
^ Pin ^ Function ^ Pin ^ Function ^
|  1  | AC Live |  4  | Frame Ground |
|  2  | AC Neutral |  5  | AC Ground * |
|  3  | Frame Ground  |  6  | Frame Ground |

* According to the schematic, this is connected only internally between this connector and FL UNIT (fluorescent light) connector.  I assume it's for Earth Ground, where a 3-prong connector is used.  

===== FL Unit =====
{{:arcade:vlp-03v.png | }}
^ Pin ^ Function ^
|  1  | AC Live |
|  2  | AC Neutral |
|  3  | AC Ground *  |

* According to the schematic, this is connected only internally between this connector and AC Input connector.  I assume it's for Earth Ground, where a 3-prong connector is used.  

===== Degauss =====
Nothing special here.  2 pins, connected to the monitor's Degauss input.  

{{:arcade:vlp-02v.png | }}
^ Pin ^ Function ^
|  1  | Degauss |
|  2  | Degauss |