Megadrive to Atari Adapter (Bliss-Box Bridge Universal Adapter)

How the DB9 to Atari Adapter Works

The Bliss-Box Bridge Adapter uses a communication protocol called LLAPI(Low-Level API). LLAPI was originally developed for internal Bliss-Box products, but it is now fully open-source for the community. All modern Bliss-Box adapters support LLAPI, allowing the Bridge to read the controller’s raw data and translate it into the format required by the output device—acting just like a native controller.

Once connected, the Bridge communicates seamlessly between your Sega Master System, Mega Drive / Genesis and other DB9 style controllers and your Atari consoles. The Gamer Pro adapter will take in input from a wide range of DB( style controllers from signal butter variants to multiple  button controller liek the 3DO. Controllers with keypads line up with consoles that support keypads, and analog inputs like the HD-200 act as a paddle output for 5200 and 2600 conses.  

 

Supported DB9 Controllers

  • Sega Genesis / Mega Drive 3-button and 6-button controllers
  • Sega Master System controllers
  • Atari 2600 and 7800 joysticks
  • Commodore 64-compatible joysticks
  • Intellivision (and FB) and Coleco pads
  • Bally, Atari paddles, Atari TrackBalls
  • 3d0 pads and 3d0 analog sticks
  • Amiga CD32 pads
  • More support foudn on the  ( check compatibility list) 

 

Supported Bliss-Box Adapters

 

Supported Atari Consoles

  • Atari 2600
  • Atari 7800
  • Atari 5200
  • Atari Jaguar
  • Atari Game Station Pro

 

Features

  • Wide peripheral support
    Works with keypads, paddles, joysticks, arcade sticks, and standard controllers.

  • Console-synced timing
    Latency remains tied to the original console’s timing for accurate input response.

  • Flexible controller mapping
    Pre-flashed and runtime mapping options available.

  • Full Bliss-Box feature set
    All LLAPI-enabled adapters unlock the complete range of Bliss-Box capabilities.

     

    Setup Guide

    1. Connect your Sega Master System, Mega Drive / Genesis controller to the Bliss-Box adapter using the DB9 cable.

    2. Plug the adapter’s USB output into the Bliss-Box Bridge.

    3. Ensure the Bridge firmware is flashed for retro firmware

    4. Connect the Bridge to your Atari console with the correct output cable. 

    5. Your controller should now register as a native Atari controller.

     

    Where to Buy

    You can purchase the Bliss-Box Bridge and compatible DB15 cable directly from our online store: Visit Bliss-Box.com. You will need both a Bridge and an Adapter that supports LLAPI. 

     

    Related Adapters

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    Effective Date: September 2025

     

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