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Step 2Introducing the Piggyback connector
First, let's get comfy with the piggyback connector on the UPCB. The first picture is straight from the schematic, and shows the labels for each of the pins.
Most of the labels should be very obvious. Up, Down, Jab, Strong, Fierce, these are all the lines for those buttons and directions.
VCC and GNG is our power and ground, respectively.
RB0 is another name for the Start button. Because we want to control the Start button for Tournament mode, we send it elsewhere. Don't worry about it, just remember RB0 is the Start button.
That leaves just two lines: DC_1 and DC_2. The actual data lines that talk to the Dreamcast will go through here. These two lines go to the 4066N chip on the UPCB. The 4066N acts like a traffic cop, directing traffic. When we know we need to use the piggybacked controller, the two DC lines are connected to the UPCB cable. If we're not using the piggybacked controller, they are disconnected from everything else.
The second picture shows a close-up of the connect that plugs into the piggyback connector, called an IDC connector. The ribbon cable that the IDC connector goes on is shown next to it. You can see the little teeth of the IDC connector; these will bite into the ribbon cable and connect to the metal wire in each strand. You'll see those teeth are staggered. The upper left most pin, DC_2, will bite into the blue strand. The upper right most pin (Ground) will bite into the green strand. The left hand side, second from the top, DC_1, will bite into the yellow strand, and so on, all the way down until the very last brown strand, which will connect to the lowest right pin, VCC.
So now we know which wire of the ribbon cable does what. Let's take a peek at the Dreamcast board and see what we're connecting them to.
Most of the labels should be very obvious. Up, Down, Jab, Strong, Fierce, these are all the lines for those buttons and directions.
VCC and GNG is our power and ground, respectively.
RB0 is another name for the Start button. Because we want to control the Start button for Tournament mode, we send it elsewhere. Don't worry about it, just remember RB0 is the Start button.
That leaves just two lines: DC_1 and DC_2. The actual data lines that talk to the Dreamcast will go through here. These two lines go to the 4066N chip on the UPCB. The 4066N acts like a traffic cop, directing traffic. When we know we need to use the piggybacked controller, the two DC lines are connected to the UPCB cable. If we're not using the piggybacked controller, they are disconnected from everything else.
The second picture shows a close-up of the connect that plugs into the piggyback connector, called an IDC connector. The ribbon cable that the IDC connector goes on is shown next to it. You can see the little teeth of the IDC connector; these will bite into the ribbon cable and connect to the metal wire in each strand. You'll see those teeth are staggered. The upper left most pin, DC_2, will bite into the blue strand. The upper right most pin (Ground) will bite into the green strand. The left hand side, second from the top, DC_1, will bite into the yellow strand, and so on, all the way down until the very last brown strand, which will connect to the lowest right pin, VCC.
So now we know which wire of the ribbon cable does what. Let's take a peek at the Dreamcast board and see what we're connecting them to.
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