Sega 2L12B Adapter

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A modified 2L12B adapter
A modified 2L12B adapter on a Sega New Astro City

The Sega 2L12B Adapter, also known as Sega Jamma/Jamma+ Adapter, is an adapter used to connect the Sega 2 lever 12 buttons panels to Jamma+ games. It is also possible to alter the wiring of this connector so it also act as a button remapper.

It connects between the various button looms from the panel and the panel connectors and reroutes the buttons 4 and 5 connected on the Sega Extra Button Loom connector to the regular player 1 and player 2 panel connector that are linked to the Jamma edge connector.

Using this connector allows fast and easy switching from a system using a Jamma and kick harness setup like CPS2 to another system using a Jamma+ setup like SNK Neo Geo MVS.

Sega part number

605-0028

Pinout

This is the unmodified pinout of the adapter. The color coding of the extra button connector may vary.

Input

White 12 pin AMP Universal Power female housing
Pin Function Wire color
01 1P Start Sky blue
02 1P Right Pink
03 1P Left Brown
04 1P Up Purple
05 1P Down Light green
06 1P SW1 Blue
07 1P SW2 Green
08 1P SW3 Orange
09 NC N/A
10 NC N/A
11 +5V Yellow
12 GND White
Orange 12 pin AMP Universal Power female housing
Pin Function Wire color
01 2P Start Sky blue/White
02 2P Right Pink/White
03 2P Left Brown/White
04 2P Up Purple/White
05 2P Down Light green/White
06 2P SW1 Blue/White
07 2P SW2 Green/White
08 2P SW3 Orange/White
09 NC N/A
10 NC N/A
11 +5V Yellow
12 GND White
White 10 pin AMP Universal Power female housing
Pin Function Wire color
01 1P SW4 White/Red
02 1P SW5 White/Blue
03 1P SW6 White/Yellow
04 1P GND White
05 2P SW4 White/Orange
06 2P SW4 White/Black
07 2P SW4 White/Gray
08 2P GND White
09 +5V Yellow
10 GND White

Output

White 12 pin AMP Universal Power male connector
Pin Function Wire color
01 1P Start Sky blue
02 1P Right Pink
03 1P Left Brown
04 1P Up Purple
05 1P Down Light green
06 1P SW1 Blue
07 1P SW2 Green
08 1P SW3 Orange
09 1P SW4 White/Red
10 1P SW5 White/Blue
11 +5V Yellow
12 GND and 1P GND White
Orange 12 pin AMP Universal Power male connector
Pin Function Wire color
01 2P Start Sky blue/White
02 2P Right Pink/White
03 2P Left Brown/White
04 2P Up Purple/White
05 2P Down Light green/White
06 2P SW1 Blue/White
07 2P SW2 Green/White
08 2P SW3 Orange/White
09 2P SW4 White/Orange
10 2P SW5 White/Black
11 +5V Yellow
12 GND and 2P GND White
White 10 pin AMP Universal Power male connector
Pin Function Wire color
01 1P SW6 White/Yellow
02 NC N/A
03 NC N/A
04 NC N/A
05 2P SW6 White/Gray
06 NC N/A
07 NC N/A
08 NC N/A
09 +5V Yellow
10 GND White

Modifying the adapter

Template:Expand section

It is possible to modify the adapter in order to act as a button remapper.

Used with

Modified version of the adapter can be used on any cabinet using the standard Sega controls pinout in order to reassign buttons.

References