Saturn Country Mod
(For details of a switchless mod, have a look here)
This guide is based on the one here, this mod allows you change from Eur/Jap/US mode with just a single switch (most guides use 2 switches for this modification).
There are many different versions of the Saturn motherboard, so a comprehensive guide would be very difficult.
If you need help constructing the circuit from Mameworld, then here's a diagram of the Strip/Vero board that mmmonkey has designed.
The basic components are a piece of Vero board (8 tracks tall, 12 holes wide), a 7404 (I keep getting supplied a 74LS04 which works fine) Hex Inverter, 2 1K resistors, some wire and a Single Pole/Double Throw Centre Off switch.
Once you've cut your board to size, cut along the some of the tracks as shown in the diagram at the top of the page and the following photo. Some people drill the holes to make them bigger so the break the track, mmmonkey just makes some cuts using a sharp blade, then picks a bit out.
Then prepare some wire ready to join the link points. mmmonkey used some legs from resistors used in another mod, and bent them into shape, then soldered them into place and cut the excess legs off.
Now it's time to solder the 7404 Hex Inverter into place, make sure you put it in the correct way around, there is usually an indent and/or a dot showing you which end is pin 1 (a dot on the diagram above). mmmonkey soldered all the legs, this isn't necessary - but it was easier than double checking which legs were necessary. Find something to rest under the Vero Board to make it level whilst it is upside down (like the resistor shown below).
Once the Hex Inverter is complete, double check where the two 1k resistors should go, solder them into place and trim the excess leg off.
