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# Audio & Video
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## VERA Video
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## VERA Audio
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## The Sentinel 65X A/V Port
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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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# Controller Ports
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Sentinel 65X supports up to four SNES-compatible controller ports, read under software control using the integrated GPIO pins on the CPU.
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The kernel itself will have, as part of its system timer IRQ, the job of reading in all controllers and storing their state at a known address in memory.
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