Original Xbox Serial USB Adapter
Overview
This device allows for serial communication with an original Xbox and is primarily used for kernel debugging.
Requirements
Hardware
Any original Xbox of any version (although versions 1.3-1.5 require LFRAME# reconnect and version 1.6 requires full LPC port rebuild, including LFRAME#). Debug and development kits will work without modification, however, retail boxes need to use a hacked kernel (X2 5035 or iND 5004 for example) that initializes superio as well as have a 2x8 2.54mm pin header soldered to the LPC port.
Software
A Windows OS capable of running WinDbg; versions 4.0.0018.0 (XDK) or 6.12.0002.633 have been tested successfully.
KiCad to work with the project files if needed.
Usage
Connect a micro USB cable from your PC to the serial adapter, then the IDC cable ends into the serial adapter and Xbox LPC port pin headers respectively, ensuring the correct alignment and orientation as shown in the image above. Incorrect orientation may result in damage to the adapter and/or your Xbox, you have been warned!
Within WinDbg press CTRL+K to bring up the connection dialog and enter 115200 for the baud rate along with the COM# port as detected by your computer in device manager.
CTRL+Break can be used to pause execution, F5 to continue, and F10/F11 to step over or through instructions.
CTRL+ALT+D will toggle verbose windbg protocol output for troubleshooting if needed.
The adapter's blue RX LED indicates signals sent from the PC and the green TX LED from the Xbox.
Components
Bold designators are the bare minimum required for basic functionality but stability may be questionable. The entire UART to USB circuit and/or LED output is optional and can be replaced with an external 3.3V UART to USB cable jumpered to J2 instead.
| Count | Part/Value | Description | Designators | Notes |
|---|---|---|---|---|
| 1 | 2x8 2.54mm | Pin Header | JP1 | |
| 1 | 1x4 2.54mm | Pin Header | J2 | |
| 1 | 1x2 2.54mm | Pin Header | J3 | |
| 1 | Wuerth_629105150521 | USB Micro-B Connector | J1 | |
| 1 | SG5032CAN | 14.318MHz 5032 Crystal Oscillator | Y1 | |
| 1 | LPC47M192 | SuperIO | U1 | The LPC47M157 is also compatible |
| 1 | FT231XS | UART to USB | U2 | |
| 2 | 27R | 0603 SMD Resistor | R1, R3 | Filtering |
| 1 | 470R | 0603 SMD Resistor | R5 | LED power dissipation |
| 1 | 1.2k | 0603 SMD Resistor | R6 | LED power dissipation |
| 2 | 10k | 0603 SMD Resistor | R2, R4 | Configuration pull-ups/downs |
| 1 | 33 Ohm | 0603 Ferrite Bead | FB1 | Filtering, can be substituted with a 0 ohm resistor or solder bridge |
| 3 | 47pF | 0603 SMD Capacitor | C4, C6, C7 | Filtering |
| 6 | 10nF | 0603 SMD Capacitor | C3, C8, C9, C10, C12, C13 | Decoupling |
| 2 | 100nF | 0603 SMD Capacitor | C2, C11 | Decoupling |
| 1 | 4.7uF | 0603 SMD Capacitor | C1 | Bulk |
| 1 | 10uF | 0603 SMD Capacitor | C5 | Bulk |
| 1 | Green | 0603 SMD LED | D1 | |
| 1 | Blue | 0603 SMD LED | D2 |
External Components
| Count | Part/Value | Description | Designators | Notes |
|---|---|---|---|---|
| 1 | 2x8 2.54mm | Pin Header | N/A | Retail Xbox LPC Connector |
| 1 | 16 Wire 2.54mm | Female to Female IDC Ribbon Cable | N/A | Keep length under 18 inches for best results |
| 1 | Micro USB Cable | Cable | N/A |
Retailers
Support
Contact xbox7887 in XboxDev on Discord.
Reference
Copyright
Copyright Mike Davis 2019.
This documentation describes Open Hardware and is licensed under the CERN OHL v. 1.2 or later.
You may redistribute and modify this documentation under the terms of the CERN OHL v.1.2 or later. (http://ohwr.org/cernohl). This documentation is distributed WITHOUT ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING OF MERCHANTABILITY, SATISFACTORY QUALITY AND FITNESS FOR A PARTICULAR PURPOSE. Please see the CERN OHL v.1.2 or later for applicable conditions