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 was originally intended for using an external device on the second controller port. With no endorsements or downloads, it's a niche utility for ROM hackers.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Automates a tedious hex-editing task that would otherwise be error-prone.
- Fixes the checksum automatically, so your patched ROM stays valid.
- Simple GUI means you don't need command-line skills to use it.
⚠️ Cons
- Zero endorsements and downloads suggest it's untested or brand new.
- Only works on Windows (Win32), so Mac/Linux users are out of luck.
- Limited to Genesis/Mega Drive ROMs—no support for other consoles.
This is for retro gamers and ROM hackers who want to play two-player games using a controller in Port 2 instead of Port 1. It's also handy for modders who need to remap controller inputs for specific hardware setups.
💡 Beginner Tips
- Make a backup of your original ROM before applying the swap.
- Test the patched ROM in an emulator first to ensure the swap works as expected.
- If you're using a flash cart, verify the checksum is correct after patching.
📊 Mod Details
- Game
- N64 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 N64 Hacks Mods
Apply .xdelta patches. Use Project64 emulator or real N64 with flashcart.
📖 Full step-by-step install guide for N64 Hacks →
Visit the official mod page for specific installation instructions for this mod.
🎮 Need cheat codes or console commands? Check ur gaming wiki for N64 Hacks commands, item IDs, and more.
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