Overview of the assembly showing position, orientation, and notation. Part 1: First, install the LEDs on the top of the board. There is one red and one yellow LED for power and serial status respectively. Locate D1 on the board. It is a circular component. Also locate the red LED. Each LED has two leads. The shorter of the two leads is the cathode, which should be positioned closest to the "D1" and "D2" markings on the board. The shorter lead goes nearest the "D1" and "D2" marking. Insert the red LED cathode nearest the "D1" marking. The cathode needs to be inserted in the top of the board (lead enters side with white silkscreen). Once both leads are inserted in the board, bend them slightly on the bottom side of the board and solder them in place, soldering from the bottom of the board. Try soldering one side first, flip the board over to make sure it is not bent to the side, fix if necessary, and then solder the other LED lead on the bottom side of the board. Once done, trim the excess leads flush with the bottom of the board. The yellow LED follows the same process with the shorter lead nearest the "D2" marking on the board. Part 2: Now you will install the four blue capacitors. Orientation is not important for these ceramic capacitors. They will be installed on the bottom of the board and bent flat against the board. It is easiest to bend the leads at a right angle prior to installing them on the board. Use the overview picture from Part 1 to determine the desired capacitor arrangement on the bottom of the board. Detail of capacitor placement on the board bottom. Once bent, insert the four capacitors into the four sets of holes in the middle of the board (inside the 16-pin dip rows). These should be inserted in the board with the components on the BOTTOM of the board. Once in place bend back the eight leads from the four capacitors and solder. Again, trim the excess leads flush against the TOP of the board taking care to trim close to the board. The MAX-232A chip will sit above these trimmed leads. Part 3: Next are the current limiting resistors. These resistors reduce the current traveling through the LEDs. Start with the resistor with three red bands, the 2.2K Ohm resistor. Solder this on the board next to the yellow LED. This resistor is located on the top (silkscreen) side of the board. Once in place, trim the excess leads from the bottom of the board. The 1K resistor, with red, black and brown bands, is located next to the red LED. Follow the same steps to install this resistor. Refer to part 1 if you are not sure where the resistors are placed on the top of the board. Install the MAX-232A chip on the board. This chip has a distinct marking on its top surface that indicates pin 1. The board has a similar mark on the silkscreen legend to indicate the proper orientation of the chip. Diagram of pin orientation on the MAX232A chip. Insert the chip on the board (on the opposite side from the blue capacitors). This may take some effort as the chip's pins tend to splay out somewhat. Once in place, flip the board over and solder all 16 pins of the MAX chip. To complete this step, use wire cutters to trim down all 16 leads of this chip. The completed board. Part 4: Finally, you need to wire the board with the appropriate connectors. The board is labeled with a host side and a BrainStem side. We start with the host side. Overview showing the board connections. Each platform has a unique connector and pin arrangement. The proper three connections (GND, HTX, and HRX) need to be made with your platform's connector. The HTX and HRX symbols are from the perspective of the host computer. Common platform connections. The BrainStem side of the board is next. This involves four connections in this order on the BrainStem serial connector: GND, STX, Vcc, SRX. BrainStem™ serial outputs. All four wires must be soldered in on the interface cable board with the marked wire on the ribbon cable connecting to the ground connection. The completed board cable.