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 device on a different port. With zero endorsements and downloads, it's a niche utility for ROM hackers.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Handy for ROM hackers who need to remap controller inputs for external devices.
- Automatically fixes the checksum, saving you from manual patching.
- Simple GUI means you don't need to mess with hex editors.
⚠️ Cons
- Zero endorsements and downloads—untested by the community, so use at your own risk.
- Only works on Genesis/Mega Drive ROMs, so it's useless for other systems.
- Potential compatibility risk with ROMs that use non-standard I/O handling.
This is for ROM hackers and modders who want to swap controller ports on Genesis/Mega Drive games, especially if you're using an external device that needs to be on a specific port. It's also for tinkerers who enjoy low-level ROM editing tools.
💡 Beginner Tips
- Make sure your ROM is a standard Genesis/Mega Drive ROM; homebrew or hacks with unusual headers might not work.
- Always keep a backup of your original ROM before applying the swap, just in case.
- Test the patched ROM in an emulator first to verify the swap worked before using it on real hardware.
📊 Mod Details
- Game
- Genesis 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 Genesis Hacks Mods
Apply .ips patches. Use BlastEm emulator or real Genesis with flashcart.
📖 Full step-by-step install guide for Genesis Hacks →
Visit the official mod page for specific installation instructions for this mod.
🎮 Need cheat codes or console commands? Check ur gaming wiki for Genesis Hacks commands, item IDs, and more.
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