Once installed, this mod will allow you to select from various modes all by pressing the reset button – you are presented with feedback by a multicolour power light (RGB LED).
When you first turn the console on you will be presented with a RED power light. This is telling you that you are running your system in 50Hz mode. If you press and hold the RESET button, the power light will turn off and then cycle through three colours – RED – GREEN – BLUE, it will repeat this cycle until you let go of the button.
The Youtube video will give you a good idea of what’s going on.
Firstly, a little bit of background
When games were designed for the Super Nintendo console, they were designed to run at a screen refresh rate of 60hz. Which is the NTSC standard. So when games get ported over to enable them to be played on PAL consoles (which run at 50hz)
A couple of annoying things happen
You may very well have seen that people have installed various switches to enable them to select between 50hz and 60hz modes.
We’ll that’s where this mod comes into it.
What you will need
This circuit board will contain the pic microcontroller and the three resistors for the LED. Here is the complete circuit – the components on the board are outlined are contained within the orange rectangle.
Once the board is constructed, you need to cut a track that comes from the reset switch. You will then need to solder a wire to where the track was going to. In order to solder the wire into that small via (hole) you will need to scratch off the green coating with a sharp knife / scalpel.
Once done, flip the circuit board over and you will see the underside side of the reset switch. You need to solder in your 10k resistor as shown and then solder another wire to the reset switch output and then put this wire through a hole to bring it to the top side of the board. ‘This is our output to the microcontroller’ goes to PORTA pin 5.
Now that those wires are done, we will move onto something a little more tricky.
You need to lift to legs from the two PPU chips. You need to lift PPU1 pin 24 and also PPU2 pin 30 as shown. Once you have lifted them, place some masking tape underneath them to prevent them touching any other leg or pad. Then solder a wire to each of these legs. Both of these wires now go to the same microcontroller pin – which is PORTA pin 1.
You will also want to desolder and remove the resistor connected to the led .
Now you will have two pads in which to solder the new RGB LED to. solder the cathode of the RGB LED to the large pad (or the pad that does NOT goto the resistor) this pad is ground. Once done, solder one of the remaining three legs to the other pad (to keep the LED stable) just like this:
Then you can place some masking tape under the legs to prevent them shorting out.
Once done, solder on three wires to the Red, Green and Blue legs.
Finally, you need to connect power (+5v and ground) to the microcontroller. You can grab ground easily by soldering it to the big exposed solder plains on the board (the big silver rectangles around the edge of the board).