A combo port that connects to external SATA (eSATA) drives and USB devices with cables up to two meters long. The eSATA USB Hybrid Port (EUHP) also eliminates the external power cable by supplying ...

The yellow line traces the signal from the GPIO to the USB power switch. Because the USB current limit is set in software, there must be a few bits of hardware that do the actual work. Tucked away ...