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This is a cable with a female DB9 RS232 connector on one end and a four-pin femaie TTL header connection on the other end
Chumby motherboards had four pads that can be populated with header pins to accept this cable - it then become the device's serial console. This cable is indispensible for kernel-level development.
Pin 1: Yellow GND
Pin 2: Red 3-5V
Pin 3: Green TTL in
Pin 4: Black TTL out
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