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| I picked up these incredibly cheap USB gamepads on eBay: Two SNES-style for $8.90 total, and two Genesis style for $15.24 total. They work reasonably well. |
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| Let's take them apart, starting with the SNES-style controller. Removing the screws from the back reveals the boring side of the PCB, showing the crystal and the four standard USB wires. |
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| Flipping over the board reveals a glop top and ten nice pads and two through-hole connections for the shoulder buttons that you could solder to, giving you twelve inputs if you wanted to use the PCB as general button-like-thing-to-USB converter. |
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| Here's what the SNES-style controller looks like with the buttons and D-pad removed. |
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| Now let's take look at the Genesis-style controller. Removing the screws from the back once again reveals a crystal and the four standard USB wires. Also note that the shoulder buttons are tactile switches. |
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| Flipping over the board reveals a glop top, eleven nice pads and two through-hole connections for the shoulder buttons that you could solder to, giving you thirteen inputs if you wanted to use the PCB as general button-like-thing-to-USB converter. |
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| Here's what it looks like with the rubber membranes removed. |
For completeness, here's what the individual buttons look like, along with the inside of the back of the controller:
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