Alpha Denshi to JAMMA Adapter

Description

Alpha Denshi, later renamed to ADK Corporation was an arcade game manufacturer mainly known for their Neo-Geo releases. In the 1980s however, Alpha Denshi released a number of arcade titles on their own platform. There was a mix of games that ran on unique hardware with different pinouts, and also some that ran on a common hardware platform with the same pinout.  These games can be easily identified by the additional 12 pin video edge connector of the video board. This adapter converts only the Alpha Denshi games with this connector.

Images

Pinout

This adapter follows the following pinout scheme:

Main Connector

SOLDER SIDEPARTS SIDE
GNDGND
GNDGND
GNDGND
NCVSYNC
NCVRED
P2STARTVBLUE
P2B3VGREEN
P2B2P2UP
COIN2P1START
COIN1P1B3
NCP1B2
NCP1B1
P2B1P1LEFT
P2LEFTP1RIGHT
P2RIGHTP1DOWN
P2DOWNP1UP
+5V+5V
+5V+5V

(PCB edge connector facing away, list is ordered right to left)

Sound Board Connector

PINFUNCTION
1+12V
2+5V
3SPK+
4SPK-
5GND
6GND

Compatible Games

This is the list of compatible games that can be used with this adapter:

The adapter has been tested with a Kyros PCB.

Revision History:

Rev 1.0: Initial Design – current production version.

Specifications

Board Size: 49mm x 112mm
Current Carrying Capacity: 5V – 12A, 12V-3A