JAMMA loom

[venkman]

i think i'm going to re-wire this cab i picked up.

i had a look about the forums and found a really great tutorial on how to bundle / wire up a jamma loom, this is it here: http://homearcade.org/BBBB/jh.html

now this guy has soldered wires onto all but 2 of the spaces in the board. i understand that 2 of them are for the board's key.. but how come when i've been looking for a loom to buy it has far less wires. well.. around 6 less??

what do the missing ones do / what do the manufacturers think i don't need to do?

plus, the ones for sale don't have the wires in the same bundles as he does as far as i can tell from the pictures and diagram.

tutorial:


for sale:


(doesn't match does it? )
   1. Power
   2. Audio (Speaker)
   3. Video-Sync
   4. Coin Door
   5. Player 1 (Controls)
   6. Player 2 (Controls)


sorry if this question is nuts !

i'm looking to make this as plug-and-play as possible.
that includes avoiding soldering if at all possible! 

[Ken Layton]

Harnesses that have all pin positions filled are known as "fully loaded". These generally cost more since more copper wire and connector pins are being used in making them. Also, the better quality fully loaded harnesses use 18 gauge wire for the power connections and 20 or 22 gauge wire for everything else.

The cheap harnesses come with 22 gauge wire for the power connections and not every pin is connected in these harnesses.

If buying a ready-made harness always ask the seller if the connector is "fully loaded" (every pin connected). The key/index positions never have any wires or pins there. Sometimes a small white plastic spacer is inserted in the index position to keep you from plugging the Jamma connector the wrong way on a board and damaging it.

[mrclean]

i'm looking to make this as plug-and-play as possible.
that includes avoiding soldering if at all possible! 

What I can tell you is that I purchased 2 JAMMA Harness's from 2 different sources and one was a crappy black one with chinese lettering which the quick disconnects were both 110, and 187, where as the better "blue" JAMMA Harness that i purchased was a far better quality, with everything labled, and also which included ALL .187 quick disconnects. It had a nice detachable ground daisy chain. The wires seemed thicker gauge as well.. My advice get the blue one and you won't need to sodder.

on that one for sale from what i can make out in that picture it looks like

1 = player 1 controls (button 1,2,3 and up,down,left right on the joystick) and those other black daisy chains off to the side are ground.

2=looks like coin door wires.. i.e. ground 12v coin button1, coin mech 2 etc.

3= player 2 controls (button 1,2,3 up, down,left,right on the joystick)

4=speaker wires

5= (power wires / usually thicker gauges, no soddering just attach to your power supply)red=+5v, black = ground , yellow =+12v

6= red, green, blue, black, white. (monitor wires) sometimes from a monitor pcb it will also include yellow.. just twist yellow+white together which is sync. .. then respectivly connect red to red, blue to blue, green to green, and black is ground... don't be afraid to cut / strip get rid of that plastic molex if needed.

hopefully this helps you also:

http://www.lizardlickamusements.com/documents/jamma_pinout.pdf

[venkman]

aah wicked thanks both of your for your clear answers Ken Layton and mrclean.

so i'm looking for a fully loaded blue one with everything labeled on there, but that one that i foud for sale (on UK e-bay) is ok huh .. comes with the ground loop chain of wires, has te coin mech ones and all. hmm...

as a side note to this thread, i took a photo of the one that's on the machine right now. one of the wires has come out, there are no labeals (tho the pinout does that job) and it isn't fully loaded..



plus i'd like to know how to wire this machine up - is why i'm looking to buy a new loom.
fun and learning - who would have thought!