linked to 6 button controller section of md/gens

docs/Sega-CD.md

@@ -105,32 +105,9 @@ Add custom retroarch controls to the retroarch.cfg file in
 ```
 For more information on custom RetroArch controls see: [RetroArch Configuration](RetroArch-Configuration)
 
-### Configuring a 6 button controller
+### 6 button controller
 
-First you need to tell retroarch to use 6 buttons, because the default is to use 3.
-
-#### lr-picodrive
-
-Launch a Sega CD game and go to the Retroarch menu (default mapping: `select + x`). Go to `Quick Menu -> Core Options` and set the two input devices to `6 button pad`. Then exit the Retroarch menu. Once you quit the game, the configuration will be saved within the `retroarch-core-options.cfg` file under `/opt/retropie/configs/all`. You do not need to edit this file. These core options will also take effect on any other system which you may use lr-picodrive for (eg. Sega 32X, Sega Mega Drive).
-
-#### lr-genesis-plus-gx
-
-There are two ways to achieve this:
-
-##### Option 1
-You can edit the file `/opt/retropie/configs/segacd/retroarch.cfg` and add in the following:
-
-    input_libretro_device_p1 = "513"
-    input_libretro_device_p2 = "513"
-
-This will set the controller type to a 6 button pad, and will reload this configuration every time the emulator is launched.
-
-##### Option 2
-You can save a Core Remap File which reloads every time the emulator is launched:
-
-Go to the Retroarch menu (default mapping: `select + x`). Go to `Quick Menu -> Core Input Options` and set the User 1 and User 2 Device Type to be MD Joypad 6 Button.
-
-Scroll down on the same page and select Save Core Remap File. This will save a core remap file (.rmp) to a folder called "Genesis Plus GX" in the `/opt/retropie/configs/segacd` folder. By default this remap file will load every time the emulator is launched.
+See [6 button controller](Mega-Drive-Genesis#6-button-controller)
 
 ### 3 Button Genesis/Mega Drive Controller