15 lines
561 B
Markdown
15 lines
561 B
Markdown
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# Clock Port
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The Sentinel 65X clock port is a small, 28-pin female pin header on the mainboard, which exposes the system's debug serial line, I2C bus, reset and main interrupt lines, `PHI2` clock signal, and a 64-address memory-mapped I/O region, mapped to memory beginning at `0x00DFC0`. This region of uncommitted expansion is reserved for the use of user-installed clock port accessories.
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## Pinout
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| Pin | Label | | Label | Pin |
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| :--- | :----:| --- | :----: | ---: |
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| 1 | GND | | +3.3V | 2 |
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