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Arrow-USB-Blaster should be fully compatible to original USB Blaster with the exception that only JTAG mode is supported. Pin-out is compatible, JTAG Voltage range is limited to max 3.3V. JTAG interface on most Intel(Altera) based boards are designed so that the original USB-Blaster cable when inserted goes away from the board, same with Arrow USB Blaster2, when inserted so that USB cable goes away from the PCB then it is correct. Pin 1 in the 2x5 Female header is also marked with white dot.