Author Topic: How do you guys power up & down your home made jamma machines. (Read 2867 times)

divemaster127 · « **on:** January 10, 2008, 11:05:41 am »

I was looking for some guidance. I am building my first jamma based system, its a cocktail with a "special jamma board". The board is arriving today & will have several games this is for my wife. My question is I have built mame machines using the bitstrip, & motherboard to power the machine on/off. How do you guys setup the power on/off with a jamma not sure how to do it since a motherboard is not involved where I can hack into the wiring.

2nd question I assume their are pinout instructions in the wiki for jamma I have never wired one before.
thanks for everyone's help
dm

Kevin Mullins · « **Reply #1 on:** January 10, 2008, 11:50:38 am »

Sounds to me like you are basically building an "arcade" machine.
Simplest and best tutorial I know of: http://www.therealbobroberts.net/acwiring.html

Basically the JAMMA board is power from the switching power supply, the monitors power comes off the isolation transformer and the AC for both is interrupted by a single switch.

EDIT: forgot to add a JAMMA pinout link.
http://www.coin.demon.co.uk/jamma.htm

divemaster127 · « **Reply #2 on:** January 10, 2008, 11:52:41 am »

This board i am receiving is powerd by a computer atx power supply, if that helps
dm

Kevin Mullins · « **Reply #3 on:** January 10, 2008, 11:56:30 am »

Ah.... one of "those".

Same principal though.
Just a matter of tapping one leg of the AC supply and take it to a switch.
Exactly how you do it depends on what else you have in the cab already.

divemaster127 · « **Reply #4 on:** January 10, 2008, 12:00:58 pm »

yah its one of "those", I just starting to mount everything, I am going with a lcd this time so i think the machine should turn out pretty good
dm

vertygo · « **Reply #5 on:** January 10, 2008, 12:13:09 pm »

I didn't know "those" boards hooked up to LCDs, thought they only did arcade monitors. Just an FYI, the ArcadeVGA card has a dvi out, in case you ever go PC.

Kevin Mullins · « **Reply #6 on:** January 10, 2008, 12:18:47 pm »

I'm not sure how "they" connect to an LCD either.
What kind of LCD panel were you planning on using?

Is the JAMMA board one of those that have the vga option via a dipswitch?

divemaster127 · « **Reply #7 on:** January 10, 2008, 12:23:49 pm »

Yes, this jamma board has a vga hookup, so it will hook up like any computer monitor would, I have a 19" viewsonic lcd I picked up from ebay for $45.00. I'm going to pull the stand. I also just ordered the cocktail artwork from mamemarquee.com today. So I am looking forward to getting that put on.
dm

Kevin Mullins · « **Reply #8 on:** January 10, 2008, 12:32:57 pm »

Ah.... should be a piece of cake then with the lcd.

Are you building a cocktail version? (guessing from the artwork)

divemaster127 · « **Reply #9 on:** January 10, 2008, 12:34:03 pm »

yes, I have a 4 player standup cab right now thats mame, so this is my first shot at jamma.
dm

CheffoJeffo · « **Reply #10 on:** January 10, 2008, 12:44:19 pm »

* CheffoJeffo just yanked the PC from his vertical MAME and installed one of those

That machine was wired traditional JAMMA throughout and I just added back the switching power supply (and bloody service/test switches).

Since this is not a normal JAMMA cab, normal rules would not quite apply (although I recommend the service/test switches that are so often overlooked). Since you have an ATX supply, I think you may need to jumper some pins to get the supply to power up in the absence of a power on signal from the mobo.

Other than that, you can't go wrong with Kevin's advice.

Make sure you check your manual DIP switches before boot.

fa001 · « **Reply #11 on:** January 10, 2008, 01:18:03 pm »

Yes, to use an ATX supply one must short two pins. See the following:

http://www.techpowerup.com/articles/other/22

Then either mount the supply so its on/off is accessible or put a switch in the power line leading to the supply.

Kevin Mullins · « **Reply #12 on:** January 10, 2008, 03:36:30 pm »

In regards to the power sense line - that all crossed my mind.... but I'm curious since this particular JAMMA board is designed to be used with a pc power supply, I wonder if that part isn't already incorporated on the board itself already? (it's a possibility anyways)

divemaster127 · « **Reply #13 on:** January 10, 2008, 03:48:50 pm »

I have will have the board today or tommorrow I will let you know
dm

fa001 · « **Reply #14 on:** January 10, 2008, 04:13:49 pm »

The boards I have seen only use a 4 pin "hard drive" connector from the computer power supply. Not the 20 pin motherboard connector that has the sense line.

The other choice is to use an older AT supply that does not use a sense line.

Kevin Mullins · « **Reply #15 on:** January 10, 2008, 04:26:24 pm »

I think you have two good points.
I just looked at some pictures of those boards from different places and they did all seem to use just a 12v/5v four pin connector.

nostrebor · « **Reply #16 on:** January 10, 2008, 04:43:20 pm »

Just to be clear. These "units" are JAMMA standard, so you don't *have* to use an AT or ATX supply or a VGA monitor. If you have a fully wired JAMMA cabinet, you just plug the unit to the jamma harness and throw the switch.

If you choose to use VGA and AT power, there are connection points for both. There's even a mini-din for sound. You still need a jamma harness to connect to your controls and such.

divemaster127 · « **Reply #17 on:** January 10, 2008, 04:46:08 pm »

Ok, the new cocktail I am building is not wired already so if Im reading this right I could use a happ arcade power supply instead of a atx power supply
dm

markrvp · « **Reply #18 on:** January 10, 2008, 04:55:22 pm »

Quote from: divemaster127 on January 10, 2008, 04:46:08 pm

Ok, the new cocktail I am building is not wired already so if Im reading this right I could use a happ arcade power supply instead of a atx power supply
dm

Yes, and I would recommend using one. They are rock solid, cheap, and wire directly into the Jamma harness so you don't have to have a separate power cable running to the board.

The way I've set up my Jamma cabinets is to put a standard plug strip in the cabinet. Then you plug the monitor, the switching power supply, and the marquee light (in an upright). To turn the cabinet on or off you either unplug the plugstrip cable coming out of the cabinet or add a power switch to the cabinet. If you add the switch, then cut the end off the plug strip, cut the end off another power cable, and then twist the neutral wires together in a wire nut, twist the ground wires together in a wire nut, and wire the hot wires into the switch. That way you can leave the cord plugged in.

fa001 · « **Reply #19 on:** January 10, 2008, 05:59:53 pm »

If you are going to go with an arcade supply, you should be sure to go back to the second post and read Bob Robert's article. You will need the fuse and line filter. These are built into the computer power supply and you will also get a fan to help circulate air in your cab.

I have found old AT power supplies much cheaper and reliable than used arcade supplies.

divemaster127 · « **Reply #20 on:** January 14, 2008, 02:54:44 pm »

MY board arrived & its powered by a computer molex, so I will either be using a jumper on a atx power supply or seeing if I can hunt up a old at power supply, ideas?
dm

RayB · « **Reply #21 on:** January 15, 2008, 04:22:52 pm »

I have one of "those" boards, and I have yet to hook it up yet, but my understanding is that you have a CHOICE or power with either PC atx power supply OR through normal switcher through the JAMMA connection.

divemaster127 · « **Reply #22 on:** January 15, 2008, 04:27:43 pm »

Can you please explain what normal switcher means I have not fired up my board & I am new to jamma
dm

CheffoJeffo · « **Reply #23 on:** January 15, 2008, 04:40:04 pm »

You can run a normal arcade switching power supply

and connect the DC power outputs to the JAMMA harness

That will power your board nicely.

http://homearcade.org/BBBB/jh.html

For me the decision between arcade switcher and PC supply would lie in what I had on hand and, if I was going to run a new harness, whether I might want to change out the game in the future (in which case I would wire the power through the harness).

divemaster127 · « **Reply #24 on:** January 15, 2008, 04:43:53 pm »

I have a new $50.00 atx, a new $15.00 arcade power supply, I'm running a new harness in a new build so arcade power supply looks to be the way to go. CheffoJeffo thanks for the help this is my first run at jamma before this all builds have been mame.
dm

CheffoJeffo · « **Reply #25 on:** January 15, 2008, 04:48:53 pm »

JAMMA is easy by comparison. Just be sure to double-check your connections, particularly power, before you power up. If your JAMMA harness doesn't have a key, also be careful to get the parts/solder sides of the harness matched to the right sides of the board.

And, yeah, I would choose the arcade supply if I were you.


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