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 for players who want to use an external device on a different port. No endorsements or downloads yet, but it's a niche utility.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Handy for using external controllers or devices on the port you need.
- Automatically fixes checksum, so no manual patching hassle.
- Simple GUI—no command line needed.
⚠️ Cons
- Zero endorsements and downloads—untested by the community.
- Only works on Genesis/Mega Drive ROMs, not other systems.
- Potential compatibility risk with ROM hacks or non-standard headers.
This is for retro gamers who want to play Genesis/Mega Drive games with an external controller or device connected to the opposite port. It's also useful for modders or tool-assisted speedrunners who need to swap inputs for specific setups.
💡 Beginner Tips
- Make a backup of your original ROM before applying the swap.
- Test the patched ROM in an emulator first to ensure it works.
- If the game uses both ports for multiplayer, swapping may affect player 2 controls.
📊 Mod Details
- Game
- Snes 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 SNES Hacks Mods
Apply .ips patches. Use bsnes/Snes9x emulator or real SNES with flashcart.
📖 Full step-by-step install guide for SNES Hacks →
Visit the official mod page for specific installation instructions for this mod.
🎮 Need cheat codes or console commands? Check ur gaming wiki for SNES Hacks commands, item IDs, and more.
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