I got another board, but the pins didn't match - I figured out I needed to replace the wires.
I bought a JAMMA harness, but everything was in Chinese.
Here's how I muddled through to installing the wires to the proper places.
Step 1: What is JAMMA?
The pins are labelled with letters and numbers
- the component side is all numbers
the solder side is all letters
- not including "i" or "o" since those are similar to numbers
- starting with capitals
- ending with lower case
- the connector has a "solder" side and a "component" side. The "component" side faces the direction all the chips on the board do
- "N/C" means "not connected" to any wires
- The "KEY SLOT" is a notch in the JAMMA board. The notch makes the connector asymmetrical so you don't connect the board upside-down. Some connectors have a plastic piece here.
- some games have 4 buttons, so pins "c" and "25" are these 4th buttons