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I just noticed 2 extra test points on my Proxmark3 (besides the HF & LF antenna test points).
One is next to the JTAG connector, and the other one is on one of the long edges of the PCB (next to the ARM).
To what are they connected?
If you connect the right kind of antenna to these two test points, it will unlock a special frequency used to monitor special secret services communications .......
I'm joking, I have noticed these two test points in the past, and I was wondering the same thing. Excellent question DidierStevens
TP1 (that's the one next to the ADC, near the exact center of the board) is connected to the output of the MUX and shows the ADC input. TP7 (on the lower right side of the board, below the AT91SAM7) is connected to an output of the FPGA and can be used by the FPGA code to output a debug signal (that's output dbg in fpga/fpga.v). TP6 (that's the big loop directly below the ARM JTAG connector) is simply connected to GND to give an easily accessible reference ground.
Thanks henryk!