Install a JAMMA Harness in an Arcade Cabinet
JAMMA is an industry standardized layout for arcade game board connectors.
The name JAMMA stands for "Japan Amusement Machinery Manufacturers Association," and it became a de factostandard sometime in the 1980s.
The pins are labelled with letters and numbers
ing with capitals
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
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What this means for arcade game owners is that any post JAMMA game board ("PCB") can be plugged into any JAMMA compliant arcade game cabinet, and it will pandora leather bracelet just magically work. Pretty neat!
What is less neat is many used cabinets have been a little abused by their previous owners. Damage from players and hasty fixes may equal some pretty insane problems with the hardware.
Older games, like this IKARI Warriors cabinet, had a PCB pinout that doesn't match JAMMA. In order to use the cabinet for JAMMA games, one must pandora style charms replace the connector, or even rewire the entire cabinet, being careful to match each wire to the proper place on the connector.
As you can see, on my machine, not only was the original board non JAMMA (it was a proprietary pinout used by SNK), but also someone, possibly a repairman, wired the cabinet in a THIRD pinout, which I call "sorta JAMMA." The SNK board was connected to the cabinet with this janky board. It was totally unlabeled the pen markings are my attempt to make some sense out of the board.
The "CSI: Arcade Operator" portion of our program: from the burn marks on the GROUND connector, we can infer that the traces and board were not rated for the amount of current for the entire machine running through a single trace (oopsie!). There were four GND connections, but they weren't connected to each other, and from the look of things all the power for the entire board was going through this one connector.
The board connector fried, and rather than connect the other grounds, the operator connected another single wire to the ground, likely because they didn't know anything about how electricity works or Ohm's Law or the Joule effect basically "if you put a lot of current through a tiny wire it cheap pandora bracelets will melt or catch fire." This next little wire also fried.
if you look closely you can see a similar problem happened to the +5V connection, and it was re soldered over and over again.
The short version: I have to rehabilitate this cabinet to get my game working. I may as well get it working in a modern way that can use other games, don't you think?
Step 3: The JAMMA where can you buy a pandora bracelet Harness
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These days, you can buy an entire harness which is pre wired into a "loom." If you are lucky, the wires will already be bundled with zip ties into sensible groupings.
If you are wiring your cabinet, at some point you will have to know what every wire does. This is easier than it sounds you literally follow the wire from where it s, in its known position on the connector, to wherever it ends.
To make things easier to figure out, I:
labelled the groups (with blue tape and a maker)
put spiral wire wrapping on the larger bundles this is a plastic spiral you can buy at Radio Shack to hold wires together.
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