Sega Master System Switchless Region & Dual Controller Pause Button Mod Kit


Mod Kit Includes:

  • 1 x Sega Master System Region & Pause Board
  • 4 x Controller Switch Boards (2 x 4mm & 2 x 5mm central peg holes)
  • 2 x High Quality Branded Tactile Switches (not from Aliexpress/eBay)
  • 1 x 5cm Spacer Tubing


  • Allows game pause for two controllers
  • 50 & 60 hertz video rate switching for full screen, full speed gaming
  • 4 extended regions. 50Hz / 60Hz / 60Hz+FM / & 60Hz+FM JPN Mode
  • Switchless support for Tim Worthington’s FM Sound Module


  • 1 x 3.5mm HSS Twist Drill Bit ( Link )
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This is a combined switchless region and dual controller pause button mod kit for Sega Master System model 1. There are three versions of the kit available, quick solder boards for SEGA 315-5237 and SEGA 315-5216 chips, and a standard free mounting version. Please open your console to know which version you need.

If you have a model 2 Master System it is recommended to use the separate Dual Pause Button QSB mod kit and the Master System 2 region mod kit as this will require less wire work and allow for a neater install.

50/60 Hertz Video Rate Switching

When the Master System Switchless Region Mod is correctly installed the console will be able to run games in their correct aspect ratio and speed.

The reset button is used to cycle through the video refresh rates.

  • Setting 1 = Green LED – 60Hz
  • Setting 2 = Red LED – 50Hz

If you are running your PAL systems in 50Hz, you are really doing the games a great disservice. I consider these switchless mods necessary for PAL consoles.

Tim Worthington’s FM Sound Module Support

If you want to run Tim Worthington’s FM sound module you usually have to install an On/Off switch by drilling a hole in the back of the console. With this region mod the FM sound module can be turned on and off via pushing the reset button. This feature is activated by closing the FM jumper to the Y position. In this mode there are four modes selectable via the reset button. Standard 50Hz (Red LED), Standard 60Hz (Green LED), 60Hz with FM sound activated (Yellow LED), and 60Hz with FM sound module & Japanese region activated (Yellow LED). The extra Japanese mode is required for games like Wonder Boy 3 which will only output FM sound when the console is set to the Japanese region.

Dual Controller Pause Button

The Sega Master System is a fun console but Sega did not include a pause button on the controller, instead they put one on the console itself. Many games require pausing to access the game inventories and because of this lack of an easy access pause button it can often make what should be a fun experience into a bit of a chore. Did you know you can turn on the ring you collect in Alex Kidd in Miracle World and shoot stuff? makes for a much more fun experience. This kit allows you to access the important in game menus with your controller to vastly improve the Master System gaming experience.

Up until now the only way to install the pause button into the controller was to do a messy deadbug install with no real way of making sure the switch hole was positioned well.

My kit makes the install a breeze.

Dual Pause Board

The Dual Pause board has everything needed to control the pause button via two controllers and it installs on the bottom of the Master System mainboard with pads placed for easy wiring.

Controller Switch Board

The controller switch boards do two things. They house the components to make the pause button work via an impossible button combination and they double as drill templates for cutting the switch holes.

With these boards the switch installs will be perfect and repeatable every time.

How does it work?

It uses a switch to activate two buttons from the D-Pad called an impossible button combination such as up and down together. This impossible button combination is ignored in software and accepted by a logic gate which then grounds the console’s real pause button.

For more info on how it works please read the install guide.

Additional information

Weight N/A
Dimensions N/A
Product Type

Mod Kit

Console Make


Console Model

Master System

Mod Attribute

50/60Hz, Controller Pause Button, FM Sound Support, Impossible Buttons, Language, Multi-Region, Quick Solder Board, Switchless Region

Designed by

Consoles Unleashed

Coded by


Mod Kit Variant

QSB for SEGA 315-5216, QSB for SEGA 315-5237, Universal / Non-QSB

Button Colour

Black, Yellow, Red, Blue


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