POST
POST codes on Xbox are sent by the southbridge via I2C to an optional MAX6958 IC to be displayed via 4x 7-Segment-Displays.
I2C Address: 0x38
f.e. I2C SDA/SCL pads from FACET connector or RF Unit can be used.
Schematic
POST Codes
| Code | Name | Description |
|---|---|---|
| 0x0075 | Boot success | |
| 0x14FF | Boot success |
Reading POST codes
There is a minimalistic POST monitor implemented via Raspberry Pi Pico. It simulates the MAX6958A I2C Slave and displays the gathered POST-codes via USB serial.
Soldering 3 wires (I2C and GND) is necessary.
Tools
References
- MAX6958 Datasheet
- MAX6958 Display module - Open source design by Martin Feldtmann
Authors: