The dual frequency oscillator will allow a region modified console to have a correct video clock frequency relative to the video refresh rate, rather than an out of spec one when using a forced video refresh rate. They make PAL/50Hz consoles comparable to real NTSC/60Hz consoles. However a DFO will not change the video encoding for colour over composite and RF video. They are ideal for RGB users that want their video to match genuine 60Hz consoles when using RGB video.
When you load up a game for the opposite video standard on your console it will end up displaying something that isn't quite right. This happens while playing PAL games on an NTSC system, or playing NTSC games on a PAL system.
If you are using composite video or S-Video you'll get a black and white image. If you are using RGB cables you should get an image that's in color, but the timing will be a little off which can cause issues with certain games. It's also possible to have other weird issues depending on the particular TV you are using.
So for the best experience when playing opposite region games it's a good idea to look into installing a dual frequency oscillator. With a dual frequency oscillator opposite region games will be displayed in color and correctly.
Genuine Texas Instruments
This mod is guaranteed to be manufactured using genuine Texas Instruments chips purchased through authorized distributors, even in spite of low availability caused by low semiconductor stock.
About PSX version
The PSX mod is designed with a 220 Ohm output resistor onboard so you don't need to connect any additional resistor between the DFO and the CLK signal of the console.
About Saturn version
Only Sega Saturn consoles with a PLL chip (IC20 on motherboard) with part number 315-5746 can use the DFO.
The “Pin 79 lifted” version requires that pin 79 of the VDP is lifted
PAL = 14.2214765100671mhz (Switch connected to Ground)
NTSC = 14.3181818181818mhz (Switch connected to 5v).
The “No Pin Lift” version requires that pin 79 of the VDP is NOT lifted. If pin 79 is lifted, do not purchase this version.
PAL = 17.7344720496894mhz (Switch connected to Ground)
NTSC = 14.3181818181818mhz (Switch connected to 5v)
About NeoGeo version
It is only successfully tested on the NeoGeo MV-1C variant accordint to the documentation available so far. The item shipped works at 3.3v. If you wish to experiment at your own risk you can contact us for a custom solution of frequencies and voltages.