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+# Input Options
+
+The Xbox uses so called Xbox Input Devices (XID).
+The hardware side is USB with a different plug while the software side is USB without HID-descriptors.
+Technicly a XID is a USB-hub for the Memory-Units and the XBL Communicator.
+The XID Gamepad USB-Device is internally connected to that hub.
+
+To connect a device you must specify the driver for the emulated USB device and the port the device should connect to.
+You also need to specify "-usb" on the command line to add usb functionality.
+
+The ports which can be used in XQEMU are:
+
+| Xbox Port | XQEMU USB-Port         |
+| :-------: | :--------------------- |
+| Player 1  | `bus=usb-bus.0,port=3` |
+| Player 2  | `bus=usb-bus.0,port=4` |
+| Player 3  | `bus=usb-bus.0,port=1` |
+| Player 4  | `bus=usb-bus.0,port=2` |
+
+The XID is usually connected to Port 2 of the XID-hub.
+So if you have a hub for Player 1 at `bus=usb-bus.0,port=3`, your gamepad-device would connect to `bus=usb-bus.0,port=3.2`.
+
+## Emulated XID
+
+There is XID emulation in XQEMU which emulates a very basic Duke Xbox Controller [VID: 0x045e, PID: 0x0202].
+The input can't be configured at the moment but the following buttons are mapped:
+
+| Xbox Button | PC Keyboard     |
+| ----------: | :-------------- |
+| A           | Z               |
+| B           | X               |
+| X           | A               |
+| Y           | S               |
+| Start       | Backspace       |
+| Back        | Return          |
+| DPad-Up     | Arrow-Up-Key    |
+| DPad-Down   | Arrow-Down-Key  |
+| DPad-Left   | Arrow-Left-Key  |
+| DPad-Right  | Arrow-Right-Key |
+
+No other buttons or analog controls are currently mapped!
+There is no force feedback indicator either.
+
+To recreate the internal XID hub we use the existing QEMU "usb-hub" device.
+The actual XID emulation is provided by the "xbox-gamepad" device.
+
+**Example:**
+```-usb -device usb-hub,bus=usb-bus.0,port=3 -device usb-xbox-gamepad,bus=usb-bus.0,port=3.2```
+
+## USB Forwarding
+
+QEMU has the option to forward USB Devices from the host to the guest.
+The input might be delayed but it will support all features you'd expect.
+In theory even memory units or the communicator should work!
+You have 2 options to forward the xbox gamepad.
+
+You can either forward the hub or just the gamepad.
+
+To be able to forward any of the host devices you must take the following steps:
+
+1. Have an [adapter cable (this one has not been tested yet!)](http://www.amazon.com/XBOX-USB-Controller-Converter-Gamepad-Adapter/dp/B00CD0KFU0) or [build one yourself*](http://www.ocmodshop.com/how-to-use-an-xbox-controller-as-a-usb-pc-gamepad/3/)
+2. Have libusb installed
+3. Find the VID:PID (Vendor and Product ID) of the XID-Hub and/or the internal Gamepad device
+4. Make sure that libusb has the necessary permissions
+
+<sup>\* Please do not destroy original Controllers. Instead buy a cheap break-away or extension cable. By cutting it in half you can create 2 USB Adapters: 1. USB to Xbox + 2. Xbox to USB. You can still use your adapters as an extension cable for most XIDs (not working with Lightguns).</sup>
+
+On Linux you can use "lsusb" for step 2. Step 3 involves adding a udev rule on most linux distributions.
+The udev rule (/etc/udev/rules.d/999-xbox-gamepad.rules) for a Controller-S could look like this:
+```
+SUBSYSTEMS=="usb", ATTRS{idVendor}=="045e", ATTRS{idProduct}=="0288", GROUP="users", MODE="660" # Hub
+SUBSYSTEMS=="usb", ATTRS{idVendor}=="045e", ATTRS{idProduct}=="0289", GROUP="users", MODE="660" # Gamepad
+```
+
+### Hub-Forwarding
+
+To forward the entire hub of the controller we simply have to forward the hub to the emulated xbox.
+
+**Example:**
+```-usb -device usb-host,bus=usb-bus.0,port=3,vendorid=0x45e,productid=0x288```
+
+### Gamepad-Forwarding
+
+For Gamepad forwarding we create a virtual hub using QEMU and connect the XID gamepad device to port 2 of the emulated hub.
+
+**Example:**
+```-usb -device usb-hub,bus=usb-bus.0,port=3 -device usb-host,vendorid=0x45e,productid=0x289,bus=usb-bus.0,port=3.2```
+
+# Contribute
+
+If you are a developer you can also check out the [XID emulation source code](../blob/xbox/hw/xbox/xid.c).
+You could write a new driver to turn connected Xbox 360 Gamepads into original Xbox XIDs for example.
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