Sega Master System / Mark III / Game Gear
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This mod could cause permanent irreparable damage to your television if it cannot handle switching between 50/60Hz. Most US televisions can only handle the signal designed for their region. European TVs are generally more forgiving. This mod is meant to be used with a high quality television or monitor.
Cut the trace from the NTSC jumper leading to Pin 57 on the 315-5214 IC. Using a SPDT switch, solder a wire to the common (middle) of the switch to Pin 57 on the 315-5214 IC. On one of the unused legs of the switch, solder a wire to the PAL jumper pad.