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 that swaps Controller Port 1 and Port 2 I/O references in Sega Genesis/Mega Drive ROMs, then fixes the header checksum. It's intended for using external controllers on port 2. Currently has no endorsements or downloads, and the description is incomplete.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Handy for players who need to use a controller on port 2 instead of port 1.
- Automatically fixes the checksum, so you don't have to do it manually.
- Simple GUI tool—no command line needed.
⚠️ Cons
- Zero endorsements and downloads—untested by the community.
- Last updated in 2026, but no version info or compatibility details provided.
- May not work with all ROMs or emulators; potential compatibility risk.
This is for retro gamers who want to use a controller plugged into port 2 on a real Genesis or emulator, especially if their port 1 is broken or they need a specific controller setup. It's also useful for modders who want to swap controller inputs in ROMs.
💡 Beginner Tips
- Make a backup of your ROM before applying the swap, just in case.
- Test the patched ROM in your emulator to ensure the swap worked correctly.
- If you're using a real console, ensure your flash cart or repro cart supports the modified ROM.
📊 Mod Details
- Game
- Nes 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 NES Hacks Mods
Apply .ips patches. Use Mesen emulator or real NES with flashcart.
📖 Full step-by-step install guide for NES Hacks →
Visit the official mod page for specific installation instructions for this mod.
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