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Important Message

COVID-19: Mod kits to UK addresses can be posted with a second class large letter stamp via a post box so there is no restrictions or delays for me to post these. Install services and international orders need to be taken to the post office and might be affected by movement restrictions in the UK and potentially have three weeks of delay from 23rd March 2020. I am really not sure. Thanks

Sega Master System Switchless Region Mod Install Guide

  • Pin 1 – Wire to the +5V pad
  • Pin 5 – Solder a Resistor then wire to the Red LED pad
  • Pin 6 – Solder a Resistor then wire to top side through a holr to the Short Outer lead of the LED (Green)
  • Pin 11 – Wire to the Reset Line pad
  • Pin 12 – Wire to the Video Rate pad
  • Pin 13 – Wire to the Reset Button pad
  • Pin 14 – Wire to the Ground pad
  • The capacitor is soldered between pins 1 and 14 of the modchip as close as possible. (Optional)

Board Maps

Remove Original LED

1 - Remove the LED from top side of the board

2 - Lift one side of the resistor labelled R5 (VA1) or R50 (VA3). This will disconnect the LED pads from the Master System board and allow you to control the new LED from the modchip. You can choose to cut the trace but lifting the resistor pin is non-destructive.

3 - Insert the new LED into the original plastic LED sleeve that was removed from the board. You will leave the Short Outer lead (green) of the LED as the free lead.

4 - Put a 90 degree outwards bend in this short outer lead that is just slightly higher than the bottom of the plastic LED sleeve.

5 - Solder a wire to the bent lead. It will be more difficult once the LED has be soldered in place. Cover the lead/wire connection with heatshrink.

6 - Place the new LED into the original LED holes. The free Short Outer lead (green) will be towards the Master System card slot on the right.

7 - Solder the new LED in on the bottom side of the board.

8 - The wire that runs from the short out lead of the LED can be routed under the chip for a neater install, this will then need taking to the hole and through to the bottom side of the board and soldered to pin 6.

9 - Wire pin 5 to the LED pad, this will be the long outer lead of the LED.

Cut 1 - Reset

coming soon.

Cut 2 - 50/60Hz

Coming soon.