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Step 7Bonus Round - Difficulty: Moderate
Our last Bonus round again deals with the Select button.
Using a small piece called a diode, we can have one button press act as multiple button presses at the same time. For the kind of games I'm interested in, there's only one button combination that matters: Taunt.
In most Dreamcast fighting games, a taunt is done by pressing Short and Start at the same time. If you hit the Start a hair before the Short, you'll pause the game. At best, this is annoying, and at worst, it's a disqualification. Wiring up a taunt button that will never pause the game sounds perfect.
If we try to connect the Select button to both Start and Short with just wire, the Start and Short buttons will always be connected; you'll always taunt if you press Short OR Start. This is bad. By using two diodes, we can make Start and Short act as they should by themselves, and have the Select button press them both.
Diodes are neat little things that let electrons go through in only one direction. By using these, we prevent the electrons from connecting Short and Start directly. When Select is pressed, the electrons will be able to go through. Otherwise, Start and Short will remain separated, just how we want.
Just about any diode will work just fine for what we need. Get the cheapest, smallest ones you can, usually the N4148.
Every diode has a band around one end. This band tells you which way the electrons can go. Electrons can come out of the end with the band, but they can NOT go into the end with the band. We're going to connect them so the electrons can go TO the Select line from the Short and Start lines, but not the other way around.
On the Select line of the ribbon cable, you want to solder two diodes directly to it. Both of these diodes should have the band side connected to Select and each other. The other end of the diodes need to connect to the Short and Start lines, and you're done.
Remember, we want to connect them to the Short and Start lines, but they still need to connect their spots on the ribbon cable with their spots on the Agetec board.
You can use this Bonus Round along with the previous two, and have the Select button Taunt and change the VMU bank.
Using a small piece called a diode, we can have one button press act as multiple button presses at the same time. For the kind of games I'm interested in, there's only one button combination that matters: Taunt.
In most Dreamcast fighting games, a taunt is done by pressing Short and Start at the same time. If you hit the Start a hair before the Short, you'll pause the game. At best, this is annoying, and at worst, it's a disqualification. Wiring up a taunt button that will never pause the game sounds perfect.
If we try to connect the Select button to both Start and Short with just wire, the Start and Short buttons will always be connected; you'll always taunt if you press Short OR Start. This is bad. By using two diodes, we can make Start and Short act as they should by themselves, and have the Select button press them both.
Diodes are neat little things that let electrons go through in only one direction. By using these, we prevent the electrons from connecting Short and Start directly. When Select is pressed, the electrons will be able to go through. Otherwise, Start and Short will remain separated, just how we want.
Just about any diode will work just fine for what we need. Get the cheapest, smallest ones you can, usually the N4148.
Every diode has a band around one end. This band tells you which way the electrons can go. Electrons can come out of the end with the band, but they can NOT go into the end with the band. We're going to connect them so the electrons can go TO the Select line from the Short and Start lines, but not the other way around.
On the Select line of the ribbon cable, you want to solder two diodes directly to it. Both of these diodes should have the band side connected to Select and each other. The other end of the diodes need to connect to the Short and Start lines, and you're done.
Remember, we want to connect them to the Short and Start lines, but they still need to connect their spots on the ribbon cable with their spots on the Agetec board.
You can use this Bonus Round along with the previous two, and have the Select button Taunt and change the VMU bank.
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