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# POST | ||
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[POST](https://en.wikipedia.org/wiki/Power-on_self-test) codes on Xbox are sent by the southbridge via I2C to an *optional* MAX6958 IC to be displayed via 4x 7-Segment-Displays. | ||
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I2C Address: *0x38* | ||
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f.e. I2C SDA/SCL pads from [FACET connector](./facet.md) or [RF Unit](./rf-unit.md) can be used. | ||
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![7Segment Displays](../_files/post/7_seg_lighted.jpg) | ||
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## Schematic | ||
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![MAX6958 schematic](../_files/post/max6958_7seg_schematic.png) | ||
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## POST Codes | ||
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**TBD** | ||
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## References | ||
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- [MAX6958 Datasheet](https://www.analog.com/en/products/max6958.html) | ||
- [MAX6958 Display module](https://oshwlab.com/marten_7544/max6958) - Open source design by Martin Feldtmann |