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, then recomputes and fixes the header checksum. It's intended for using an external controller on a different port. Currently has no endorsements or downloads, and the description is incomplete.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Automates a tedious hex edit that would otherwise be manual and error-prone.
- Fixes the checksum automatically, so the ROM remains valid after modification.
- Simple GUI tool—no command line needed for basic swapping.
⚠️ Cons
- Zero endorsements and downloads—untested by the community, so reliability is unknown.
- Description is cut off, leaving uncertainty about supported ROM formats or limitations.
- Win32 only—no cross-platform support, so Mac/Linux users are out of luck.
This is for retro gamers who want to use a controller in the wrong port on a real Genesis/Mega Drive or emulator setup. It's also handy for ROM hackers who need to swap controller inputs for testing or accessibility reasons.
💡 Beginner Tips
- Make a backup of your original ROM before applying the swap, just in case.
- If you're using an emulator, test the swapped ROM in a couple of different emulators to ensure compatibility.
- The tool only swaps port references—it doesn't change controller mappings in emulator settings, so you may still need to configure your emulator accordingly.
📊 Mod Details
- Game
- Gb 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 GB Hacks Mods
Apply .ips patches. Use SameBoy emulator or real GB with flashcart.
📖 Full step-by-step install guide for GB Hacks →
Visit the official mod page for specific installation instructions for this mod.
🎮 Need cheat codes or console commands? Check ur gaming wiki for GB Hacks commands, item IDs, and more.
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