MD Port Swap
🟡 Updated this yearPreview
📋 About This Mod
MD Port Swap — Genesis/Mega Drive Controller Port Swapper Win32 GUI tool for Sega Genesis / Mega Drive ROMs that: 1. Swaps all Controller Port 1 <-> Port 2 I/O register references in ROM code. 2. Recomputes and fixes the ROM header checksum afterward. Originally intended for using an external controller as Port 1 on the Sega Nomad, but you can use it however you want The tool scans the whole ROM for these sequences and flips the last byte (03<->05, 09<->0B), which makes the game read/write the pad through the opposite port everywhere in the code, with no game-logic changes. This won't help games that use indirect/computed I/O addressing (rare).
MD Port Swap is a Win32 GUI tool for Sega Genesis/Mega Drive ROMs that swaps all Controller Port 1 and Port 2 I/O register references in the ROM code and recomputes the header checksum. It's intended for using an external controller setup, though the description is cut off. With zero endorsements and downloads, it's a niche utility for ROM hackers.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Automates a tedious hex edit—no manual register hunting.
- Fixes checksum automatically, so the ROM stays valid.
- Simple GUI makes it accessible even if you're not a hex editor pro.
⚠️ Cons
- Zero endorsements and downloads—untested by the community.
- Last updated in 2026, but no version info or changelog to confirm stability.
- Only works on Windows (Win32), so Mac/Linux users are out of luck.
This is for retro gamers and ROM hackers who want to swap controller ports on Genesis/Mega Drive games, maybe for a custom arcade setup or to fix a weird controller mapping. If you're comfortable running a standalone Windows tool on a ROM file, this could save you time, but it's a niche utility for a specific task.
💡 Beginner Tips
- Make a backup of your original ROM before running the swap, just in case.
- Test the swapped ROM in an emulator first to verify the port swap works as expected.
- If you're using a flash cart, ensure your cart supports the modified ROM and checksum.
📊 Mod Details
- Game
- Gc Romhacks Mods
- Author
- YoSoyNacho
- Version
- 1.0
- Downloads
- 0
- Endorsements
- 0
- Category
- miscellaneous
- Created
- 7/17/2026
- Updated
- 7/17/2026
- Tags
- Miscellaneous
🔧 How to Install GC Hacks Mods
Apply patches. Use Dolphin emulator or real GameCube with Swiss/homebrew.
📖 Full step-by-step install guide for GC Hacks →
Visit the official mod page for specific installation instructions for this mod.
🎮 Need cheat codes or console commands? Check ur gaming wiki for GC Hacks commands, item IDs, and more.
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