Does your OSSC work perfectly with your television, except when you try to use your RGB modded NES or SNES? Due to a quirk with the NES/SNES hardware design, NES and SNES consoles generate a ‘jittery’ sync signal in 240p mode. This makes their signals challenging for digitizers which use it in clock generation, and especially for devices like OSSC, where the output clock is derived directly from the sync signal. Not every HDTV is affected by this quirk, but if your other consoles are working fine while your NES or SNES has issues, chances are it’s the jitter bug.
By installing this upgrade, your NES/SNES consoles sync signal will be corrected, meaning it will be compatible when used with the OSSC and any HDTV (assuming your HDTV is compatible with the OSSC in the first place, of course).
Note – The de-jitter mod is not applicable to PAL consoles (unless you have installed a SuperCIC board) and would be dormant if installed in a stock PAL console.
We can now supply the boards with NES or SNES firmware. Simply choose the desired type from the drop down menu.
For installation instructions and more information, please visit the Github page here. Please note – This is a complex mod and requires some familiarity with the internals of the NES or SNES console. PLEASE only order if you are confident that you can fit the part. Community based technical support is available in our forum here, but unfortunately we cannot provide technical support with DIY installations, nor can we offer refunds for parts damaged due to misuse or incorrect installation.
For NES/Famicom owners there is an excellent installation guide available at the Retro Console Mods blog here. For SNES/Super Famicom owners, check out the guide here (also on Retro Console Mods).
Thanks to Markus Hiienkari and the retro gaming communities for making this mod possible. This is an open source mod, if you are interested in building your own board, click here.
If you require a fitting service for this part into your Nintendo SNES/Super Famicom console, click here. A fitting service for the NES version of this mod is coming soon.