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 Windows 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 fixes the header checksum. It's intended for using an external device on a different port. Currently has no endorsements or downloads and was last updated in July 2026.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Handy for hardware setups where you need to remap controller ports without editing hex manually.
- Automatically fixes the checksum, so you don't have to worry about corrupting your ROM.
- Simple GUI tool—no command line needed.
⚠️ Cons
- Zero endorsements and downloads—unproven in the community.
- Last updated in 2026, but no version info or compatibility details provided.
- Only works on Genesis/Mega Drive ROMs—not for other systems.
This is for retro gamers and modders who use external controllers or adapters on a Sega Genesis/Mega Drive and need to swap which port the game reads. It's also useful for anyone patching ROMs for custom hardware setups.
💡 Beginner Tips
- Make sure you have a backup of your original ROM before applying the swap.
- Test the swapped ROM in an emulator first to confirm the controller mapping works as expected.
- If you're using a flash cart, ensure it supports the modified ROM's checksum.
📊 Mod Details
- Game
- Nds 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 NDS Hacks Mods
Apply patches to your ROM. Use DeSmuME/melonds emulator or real DS with flashcart.
📖 Full step-by-step install guide for NDS Hacks →
Visit the official mod page for specific installation instructions for this mod.
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