rangerkoc / megadrive-reset-mod Goto Github PK

In-Game Reset mod with region switching feature (language and 50/60 Hz framerate) for SEGA Megadrive/Genesis. Based on Arduino compatible boards. Arduino Pro Mini (ATmega328 or ATmega168) is recommended.

• In-game reset using player one controller:
  • START + A + B + C - Soft Reset
  • START + A + B + C + DOWN - Hard Reset (if enabled, read below)
• Region switching using player one controller:
  • START + B + LEFT - Switch to North American region (Blue)
  • START + B + RIGHT - Switch to European region (Red)
  • START + B + UP - Switch to Japanese region (Purple)
  • START + B + DOWN - Switch to Asian region (Green)
• Only language switching mode (if configured, read below):
  • START + B + LEFT - Switch to English (Red)
  • START + B + RIGHT - Switch to Japanese (Green)
• Only framerate switching mode (if configured, read below):
  • START + B + UP - Switch to 60 Hz (Red)
  • START + B + DOWN - Switch to 50 Hz (Green)
• Region switching by keep pushed RESET button to cycle through regions/modes.
• Last used mode is saving and reused on next power on.
• Supported only RGB led.
• Configurable mode switching - only language switching or only 50/60 Hz framerate switching (read below).

Source code can be used by Arduino IDE or can be compiled using avr-toolchain.

Program behavior can be configured by defines that can be found in main.c file:

• ONLY_LANGUAGE_SWITCH - Use only language switching
• ONLY_FREQUENCY_SWITCH - Use only framerate switching
• HARD_RESET_ENABLED - Enable Hard Reset on separate pin on Arduino board
• RGB_LED_ENABLED - Using RGB LED
• RGB_LED_ANODE - Using RGB LED with common ANODE, else with common CATHODE
• POLL_BY_MCU_ENABLED - If no pad polling by Megadrive, MCU will poll pad itself (useful if console is halted)
• ATMEGA_CLONE_USED - Using cloned ATmega MCU (eg LGT328P), it's adding few NOP's to add some delay before reading buttons state in interrupt handler

Note: It's possible need to add few NOP's manually for MCU you using.

Here is a simplest connection pinout Arduino board to Megadrive board (without illustration):

Pictures will be added soon.