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--- hardware_faq [2026/02/10 21:21] – [USB-stick] walter
+++ hardware_faq [2026/02/16 21:34] (current) – [Build-it-Yourself] walter
@@ Line 17: / Line 17: @@
   * Atari wireless CX78+ Gamepad Controller. It also has an USB dongle for use on PC. - The mini joystick on the D-pad can be removed
     * https://atari.com/products/cx78-wireless-gamepad-emea
+  * A Sega Master System controller (two button)
+    * It will work on the C64 and is safe to use. The second button will ground one of the paddle inputs, which does not cause harm as it’s designed to read a voltage input (ground=0V)
   * **Not yet available** but in the works; Protopad from Protovision
     * https://www.protovision.games/shop/protopad/protopad.php
-<wrap hi>Do not use an (unmodified) Sega Genesis controller.</wrap>The plug fits and it works, but the internal wiring differs and will damage your port.
+== Sega Genesis Controller ==
+<wrap hi>Do not use a Sega Genesis controller.</wrap>The plug fits and it works, but the internal wiring differs and will damage your port.
+Pin 7 on the Megadrive is the ground, while Pin 7 on the C64 is +5V. So pressing the controller pad would connect 5V to places where it shouldn’t be. There are electronics inside the controller to multiplex the buttons and it is possible that would be damaged too.
 ==== Joystick ====
@@ Line 91: / Line 94: @@
      * https://www.ebay.com/itm/257183359134
      * https://www.8bitdo.com/retro-receiver-genesis-mega-drive/
+===== DB9-to-Bluetooth adapter =====
+  * joystick adapter for C64.  Supports modern controllers with low latency and dual joystick mode.
+    * https://phol-labs.com/product/phl-unibt-c64-smd-unijoysticle-ii/
 ===== Build-it-Yourself =====
 ==== Can I make my own C64 to joystick/gamepad/mouse adapter? ====