SB_Electronics
Student
Here is my offering into the world of arcade superguns. I recently picked up a Sega System 16 Golden Axe board as a repair project. While familiarising myself with the Sega System 16 I realised it used a different pinout to JAMMA. Even Sega advised users on how to connect an adapter board (why not just keep it JAMMA 
). I also realised that most superguns are designed to use DB15 controllers which aren't as readily available from what I could tell. To use a more commonly available Sega Mega Drive or Saturn cable requires another adapter board (or x2 if using 2 player). So I decided to combine it all into an all in one Sega System 16 supergun, the Sega Mega Gun.
Features:
Future features (once I get my head around CPLD coding)
). I also realised that most superguns are designed to use DB15 controllers which aren't as readily available from what I could tell. To use a more commonly available Sega Mega Drive or Saturn cable requires another adapter board (or x2 if using 2 player). So I decided to combine it all into an all in one Sega System 16 supergun, the Sega Mega Gun.Features:
- Sega 16 / 24 edge connector pinout
- 6 pin Mini-Fit-Jr connector for arcade or ATX psu
- Unused -5V pin used for ATX Power On signal
- LEDs for +5V and +12V
- Coin, Test and Service tactile buttons
- 9 pin min din AV connector for Sega Mega Drive 2 cable
- Video signals buffered and attenuated for 75 Ohm impedance via THS7374
- Audio signals galvanically isolated and attenuated for Line level audio
- Separate audio RCA outputs available
- 9 pin Mega Drive controller ports managed by onboard CPLD
- LED to indicate CPLD programming mode
Future features (once I get my head around CPLD coding)
- Button remapping
- Rapid fire function
Gerbers and Bill of Materials will be available on my GitHub 
