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This instructable will tell you step-by-step how to modify your Model 1 Sega Genesis to it may play other region games with a simple toggle switch.

Step 1: Parts Needed

1. Model 1 Sega Genesis
2. Soldering Iron
3. Solder
4. Three small gauge wire
5. Switch
6. Dremel
7. File
8. Philips head screw driver.
9. Patience

Step 2: Disassemble

In this step, we're going to completely dismantle the system.

Step 3: Locating the Proper Jumpers

Now that the board is exposed, you'll need to locate the proper jumpers labeled "JP1" and "JP2".

"JP2" has a bridge between it. Scratch this out using whatever you like.

Also, now would be a good time to heat up your soldering iron.

Step 4: The Wires

Take three different colored wires, preferably the same legenth. Strip the ends and add a bit of solder to the stripped ends. Braiding them is optional.

Step 5: The Switch

Find your switch, and add a bit of solder to the contact points.

Step 6: The Jumpers

Now, we're going to wire the jumpers.

Add a bit of solder to the jumpers, and then add the wire.

Please see the image notations below.

Step 7: The Switch (remix)

Solder the wires to the switch. Be mindful of which one is supposed to be on the center contact point of the switch.

Step 8: Cartridge Door.

Since there's a difference in cartridge size, the cartridge door will need to be modified as well. This is easy.

Again, follow the image notations.

Step 9: Finding a Home for the Switch

Now, you're going to have to bore out a space for the switch.

Follow the image notations.

Step 10: Re-Assemble!

Before you completely re-assemble this, you've probably noticed that the shield might be blocking the wires for the switch. Cut the shield. Don't cut it if you found a better placement.

After that, re-assemble it and bask in the glory of your Sega.
Well this is the &quot;THIRD&quot; (COUNT IT&lt; THIRD&gt;) Genesis that I've DESTROYED up trying to do this dumb project!!!!! The first the colors went out, the second, the processor fried, and this third one, won't switch out of PAL mode, the mhz switch won't respond, and to top it all off, I've LOST ALL MY SOUND!!!!!! <br> So is there ANYONE in the SOUTHERN CALIFORNIA AREA that I can get to come over to my place and DO THIS FOR ME CORRECTLY as I'm just too dang stupid to figure it out!!! :(:(:(:( <br> Charles
sillyzombie666 is right. Which kind of switch? @ pole or 3 pole and what voltage range do we need? The good Lord knows a lot of people show at Radio Shack and they don't have a clue....it is a &quot;must&quot; to have these questioned answered in this tutorial. Thanks man and good job on this write-up!
Did you just freaking reference True Lies, or am I reading into that? If so, you are a awesome human person.
Even though I wasn't doing this totally, I read through it and it's a very great idea! Did you figure out this yourself?<br />
I'm not going to do a region mod, but thanks for this step XD<br /> <br /> I bought a model one and when I got it yesterday, the volume switch was disconnected from the &quot;stick&quot; itself. I just wanted to be sure how to open it up, just in case. Thanks a lot =D<br />
you should point out that this can't just be any old switch<br />
&nbsp;will PAL games work with this mod? i don't have any to test, but i also don't want to buy any if they wont.....
Sadly, no, but PAL &amp;&nbsp;NTSC&nbsp;titles are usually the same.<br />
&nbsp;Works great!<br /> Thanks! :)
nice work<br /> waiting for model 2...<br />
https://www.instructables.com/id/Sega-Genesis-Model-2-Region-Mod/<br /> <br /> I&nbsp;just finished this. It's a bit harder, but it's totally worth it.<br />

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