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Step 4Jumper the 'System Select' wires
Every UPCB cable will have the main power (VCC) going into pin 8, and the main ground (GND) going into pin 1. There will also be a number of pins tied high or low (connected to VCC or GND) to tell the UPCB what system we are communicating with. These pins are the ones called High or Low in the 'How to make a UPCB cable' description in the console's .H file. Let's look at the one for the SNES, SNES.H
Before we start adding the system's cable, it is much easier to go ahead and take care of the system select lines now, without the massive console cable in the way. The only pins that say Low are pins 2-7. We are going to connect all of these so that they are electricly connected to what will be GND, pin 1. The only pins that say High are 10, 11, and 15. We are going to connect all of these so that they are electricly connected to what will be VCC, pin 8.
To do this, we are going to daisy chain a wire from one pin to the next. Using small (< 1") pieces of 30 guage wire with the ends stripped, this becomes rather easy compared to larger wires. In the picture you will see the first such connection, from pin 1 (GND) to pin 2 (Low). Next is an identical piece of wire connecting pin 2 to pin 3, another connecting pin 3 to pin 4, pin 4 to 5, pin 5 to 6, and lastly pin 6 to 7.
Next, we'll do the Highs. With another short piece of 30 guage wire, connect pin 8 (VCC) to pin 15 (high). Follow up with another wire connecting pin 15 to pin 11, and lastly one more wire connecting pin 11 to pin 12.
Now all of the pins that should be tied High or Low are connected to either GND (pin 1) for low, or VCC (pin 8) for high.
To make a UPCB cable for SNES, follow the mapping belowD-Sub 15 Pin SNES Pin1 7 (GND)2 Low3 Low4 Low5 Low6 Low7 Low8 1 (VCC)9 NC - Not connected to anything10 High11 High12 2 (Clock) 13 3 (Latch)14 4 (Data)15 High
Before we start adding the system's cable, it is much easier to go ahead and take care of the system select lines now, without the massive console cable in the way. The only pins that say Low are pins 2-7. We are going to connect all of these so that they are electricly connected to what will be GND, pin 1. The only pins that say High are 10, 11, and 15. We are going to connect all of these so that they are electricly connected to what will be VCC, pin 8.
To do this, we are going to daisy chain a wire from one pin to the next. Using small (< 1") pieces of 30 guage wire with the ends stripped, this becomes rather easy compared to larger wires. In the picture you will see the first such connection, from pin 1 (GND) to pin 2 (Low). Next is an identical piece of wire connecting pin 2 to pin 3, another connecting pin 3 to pin 4, pin 4 to 5, pin 5 to 6, and lastly pin 6 to 7.
Next, we'll do the Highs. With another short piece of 30 guage wire, connect pin 8 (VCC) to pin 15 (high). Follow up with another wire connecting pin 15 to pin 11, and lastly one more wire connecting pin 11 to pin 12.
Now all of the pins that should be tied High or Low are connected to either GND (pin 1) for low, or VCC (pin 8) for high.
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