SukkoPera/MegaDrivePlusPlus: Universal Region mod, 50/60 Hz switch and In-Game-Reset (IGR) for Sega Mega Drive (AKA Genesis) · GitHub

MegaDrive++ is a modchip for the Sega Mega Drive (AKA Genesis) with Region switching, 50/60 Hz toggling and In-Game-Reset (IGR) functionalities.

MegaDrive++ has the following features:

• EUR/USA/JAP mode switching: this effectively makes your console universal, allowing it to bypass region checks and to run all games without resorting to an adapter.
  • If you come from a PAL region, you will also be able to run most games at 60 Hz, which means full-speed and full-screen! Get rid of those black bars! See the difference here!
  • The mod is switchless, so you don't need to modify the aesthetics of your console installing ugly switches, but rather you will be able to change the region:
    • Through the Reset button: Keep pushed to cycle through modes.
    • From the Player 1 controller pad: Press Start + B + Down/Left/Right to set your desired mode.
  • The last used mode is saved automatically after 5 seconds and reused at power up.
  • Supports a single, dual or RGB LED to indicate the current mode.
• Reset-From-Pad (AKA In-Game-Reset AKA IGR): Press Start + A + B + C.
  • Supports consoles with both active-high and active-low reset signals by autosensing (i.e.: all console revisions!).
• Uses a cheap Arduino Nano board.
• Uses the popular Arduino environment, allowing for easy development, testing and modifications.
• Even though default settings are recommended, everything can be customized to taste.
• Last but not least, it is Open Source and Free Software!

If you were a MegaDrive++ user before May 2019, please note that a few things have changed:

• The old 6button/lcd_support branch has become the master branch: this is now the recommended version to use and the only supported hardware is the Arduino Nano.
• The old master branch has become the legacy branch: this is only kept for reference, it is no longer supported and won't get any updates in the future.

See this for the rationale behind this change.

If you are interested in controlling an overclock mod through your controller, please check out this PR and TurBoss's fork.

If you are interested in modding your console with MegaDrive++, please head to the wiki. There you will find full instructions about what to buy, how to compile MegaDrive++ and how to wire it in a few different Mega Drive/Genesis models that were sold.

MegaDrive++ is Copyright © 2015-2019 by SukkoPera.

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

If you want to support the development of this project, buy me a coffee:

• D4s/Seb for their work on the original mod that inspired this project.
• All the users who have contributed testing games or suggesting ideas for improvement.