MegaDrivePlusPlus - A modchip for the Sega Mega Drive (AKA Sega Genesis)
It's basically an evolution of the well known D4s/Seb mod, taking inspiration from the SuperCIC+IGR mod available for the SuperNES.
It 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: https://youtu.be/X1CW8Da8i1o!
- 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 + Up/Down to cycle through modes or Start + Down/Left/Right to set a certain mode (according to the actual chip you have installed, more on this below). - The last used mode is saved automatically after 5 seconds and reused at power up.
- Supports a single led, common-anode or common-cathode dual or RGB LEDs to indicate the current mode (Colors can be set to any value when PWM pins are available).
- 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 cheap Atmel AVR microcontrollers (ATtiny's, ATmega's, or even a full Arduino board) - If flashed on an ATtinyX4(A), it is pin-to-pin compatibile with the D4s/Seb mod.
- Even though default settings are recommended, everything can be customized to taste.
- Uses the popular Arduino environment, allowing for easy development, testing and modifications.
- Last but not least, it is Open Source and Free Software!