Genesis:Triple Bypass Mod
The "Triple Bypass" mod is a board that bypasses the audio circuit, video circuit, and optionally, the Model 1 DIN of the Sega Genesis / Mega Drive. It was originally designed by db Electronics, but has become a true open source project with many amazing contributors. There are also versions for the Master System, Nomad, and others being made by members of the community. The latest version's source files can be found on Tianfeng's GitHub or it can be purchased from Insurrection Industries or RetroGamerStuff.
 | This should be considered an expert-only mod and will (in most cases) disable composite video output. |
Details
Video
The Triple Bypass incorporates a THS7374 video amplifier for the RGB video bypass, pushing the Genesis one step closer to clean video output. Depending on your model, you may need to lift the RGBS pins from the board, or add extra filtering capacitors to the board. If you lift the pins, you'll need to re-create the pullup circuit as documented here.
The Triple Bypass outputs 75 ohm (not TTL) csync on the composite video (cvbs) pin of the multi-out, but not actual composite video. That means unless you use some alternate installation methods (and risk adding interference back into the signal), you can't use composite video cables, but you can use anything that syncs on composite video (including HD Retrovision cables).
Audio
One of the most exciting features of this board is its integrated Mega Amp 2.0, originally designed by Ace, but then tweaked by MD Fourier software to get levels that match the best version of the model 1. This means anyone installing the Triple Bypass in a have audio output that's equal to, or better than original!
The biggest difference can be heard in Genesis model 2 and 3's though. Genesis 3's will now have excellent quality stereo audio and the model 2's all sound excellent, regardless of motherboard version.
Guides
| Model | Motherboard Revision |
|---|---|
Model 1
|
|
Model 2
|
VA0 |
Model 3
|
VA1 |