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I wanted to start a series for modded consoles. The point of these articles is to give the reader an idea of the practical modifications that can be done to an older console to give the widest range of international compatibility and audio/visual options. Most of these modifications have not been done by myself but others whom are far more skilled. I wanted to start out with my (almost) completely modded genesis. I believe this unit has just about every practical modification done with the exception of a component jack. I’m not going to explain how to perform these modifications as that information is widely available but I simply want to make people aware of what can be done to expand their consoles. Also, yes, i know my system could use a cleaning and more professional labeling.

The first thing you should identify is the “best” model of the Sega Genesis. Over the years there were many versions and revisions of the overall design. The later units are more compact but also use cheaper components as cost cutting measures. The model you want is the earliest models. these models are widely regarded as having the best sounding sound chip producing superior sound to the later model 2 and 3 as well as even some later model 1’s. It also lacks the lockout chip. Sega started making the genesis with lockout chips to prevent unlicensed games. some early games like populous from EA will not play on a chipped system. Later models also force you to view a 4 to 5 second copyright screen before your game starts. The first thing to look for is the “high definition graphics” on the top. If its their its an earlier unit. Next to be sure flip it over and check the FCC-ID code on the bottom. If it reads FJ846EUSASEGA your good to go. Later revisions lack the 46E part and contain the start up screen as well as lockout chip.

first of all this is first generation genesis so it lacks the lockout chip as well as the start up copyright screen. It also contains the higher quality sound chip.

1) tired of looking at red LED lights for the past 20 years so this unit is modded with a nice green power LED.

2) the cartridge slot has been gently cut wider to accommodate Japanese cartridges.

3) CPU overclock switches. 3 for 3 OC settings, 8, 10 and 12mhtz. The Genesis uses a Motorola 68000 CPU with a stock speed of 7.67mhz. This helps in certain games that stress the system at stock CPU speeds. for example a mild overclock setting eliminates the slowdown in games like Sonic the Hedgehog when you get hit and your rings go everywhere.

4) 50htz and 60htz switch to allow European games to play correctly

5) US/Japan switch to allow Japanese games to be played correctly.

6) RCA stereo jacks

7) S-video jack for improved video output. keep in mind the original a/v jack still works so a standard Genesis composite cable or (YUK) RF connection can be used. the genesis can also natively output RGB video if you have the right cable and a SCART TV or RGB monitor.

and there you go. if there is any practical modifications i missed please let me know.



  1. That’s a beast of a Genesis! :-O
    It’s awesome the things you can do to that system!

  2. thanks, it will play any genesis/megadrive game and look good doing it. a component mod would be nice since that’s commonly the best analog method over here but its easier atm just to use RGB SCART with a PVM monitor and adaptor.

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