Neo 29 CAB, And JAMMA BOARDS?!?

Krusher

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Hey good afternoon everyone.
Another member and I have been talking about a Neo 29 cabinet.
They have been told by someone that using a jamma board in this would "Fry" or Over volt the jamma board if its a "Non neo geo", Now we both have discussed this and I would admit I was dissapointed to find out so. Now this is what was told to them, and they said see what everyone else thinks.

So heres the question in a short easy form :)
NEO 29 Cabinet, Using a non Neo geo Board would result in the Jamma board "lets say battle toads for a working example" Being over volted and or cooked, fried, killed in some way due to higher power being put out by the Neo 29 cab power supply?

Input everyone please..
(Battle toads seems to be the only working 100% board out of a box of them i bought lolol )
 
Yea, Love to see what a SR member says

Yea, Love to see what a SR member says.
I dont't doub't what the member who told me this,
Im just wondering, ok 1 If so is there a set time or is it just
overall to high to instant fry. And im kinda bummed, cause I thought
my neo 29 woulda been Neo and Jamma generic.. LOL..
Ive sofar only had a few jammas hooked up for testing lol..
damn. :(
I've heard that before also. Wait for a senior member to chime in...
 
Just a slight wiring change...
http://hardmvs.com/manuals/Jamma2NeoGeo4SlotPinout.pdf
You can buy an adaptor, you can wire a switch...

Or you can do what I do on my 29 and just wire the speakers up properly....

Pull the grounds off of the negative terminals on both speakers,
then take the Positive lead off of the left speaker
and put it on the negative terminal of the right speaker*.

*You will probably have to extend the wire.
 
Last edited:
mabey

so this would be the switch between MVS and NEO
Right?
The seller put one in.. I will have to take a pic. and show ya
Mabey its already got this done...
He mentioned it mainly had to do with sound and the test switch?
Sound about right?


Just a slight wiring change...
http://hardmvs.com/manuals/Jamma2NeoGeo4SlotPinout.pdf
You can buy an adaptor, you can wire a switch...

Or you can do what I do on my 29 and just wire the speakers up properly....

Pull the grounds off of the negative terminals on both speakers,
then take the Positive lead off of the left speaker
and put it on the negative terminal of the right speaker*.

*You will probably have to extend the wire.
 
wow.

wow, that looks cool as well. I will take a pic or two of the switch and I need to trace the connections to it, ill let you all know what I See on the connector. this was put in before i bought it, but the guy seems to not reply to messages since i bought it, the cab has a issue with a stick, go figure. But ill look at the pinouts and get some pics so you all can see the mod.
I use one of these in my Neo 29 to play jamma stuff:

http://www.jammaboards.com/store/jamma-to-neogeo-adapter/prod_228.html

The main difference is the sound (Stereo -> Mono) but there are a couple of other differences too...
 
Whoever told you that is a moron. Voltage has nothing to do with it.

Its the fact that you'll have a negative speaker output hooked to a positive speaker input, which will most likely blow the power amp on the board.
 
ok

Ok, I do see that audio issue, but voltage does seem to have some to do with it as well. If I look at Jamma solder and parts side pin 5 and E on the other side should be a NEG 5 volts, Which there is NONE on the neo harness. (I am yet to fully verify my setup) but it would appear voltage appears in the set up too. I need to spend some time and Examine the switch which is wired into mine.
Whoever told you that is a moron. Voltage has nothing to do with it.

Its the fact that you'll have a negative speaker output hooked to a positive speaker input, which will most likely blow the power amp on the board.
 
Ok, I do see that audio issue, but voltage does seem to have some to do with it as well. If I look at Jamma solder and parts side pin 5 and E on the other side should be a NEG 5 volts, Which there is NONE on the neo harness. (I am yet to fully verify my setup) but it would appear voltage appears in the set up too. I need to spend some time and Examine the switch which is wired into mine.

not all games use -5, only animals I've encountered that required it were games made by Williams/Midway (like MK, NBA Jam, etc.) I think I remember reading somewhere that Neo-Geo doesn't require it, I have a 6-in-1 switcher that doesn't have the -5 linked between the slots and the JAMMA edge, you have to add your own jumper wires for that. supposedly that switcher was made that way because some games that don't use -5, I guess the rails weren't done right on certain games and it could fry them. weird huh?

that's about all I can contribute here. you could alternatively just gut the wiring/power/speakers and replace them all with regular JAMMA wiring/power/etc. and be done with it.
 
Ok, I do see that audio issue, but voltage does seem to have some to do with it as well. If I look at Jamma solder and parts side pin 5 and E on the other side should be a NEG 5 volts, Which there is NONE on the neo harness. (I am yet to fully verify my setup) but it would appear voltage appears in the set up too. I need to spend some time and Examine the switch which is wired into mine.

Yeah, You might want to hook up the -5 also... And you should... Some Boards will supposedly break without it... But none of your mainline Jamma Games.

I do believe that the Neo-29 PSU does output a -5v signal from someplace....


But you need to wire to the Jamma Harness. I know that my 29 does not have the -5 wired.
 
Ok, I do see that audio issue, but voltage does seem to have some to do with it as well. If I look at Jamma solder and parts side pin 5 and E on the other side should be a NEG 5 volts, Which there is NONE on the neo harness. (I am yet to fully verify my setup) but it would appear voltage appears in the set up too. I need to spend some time and Examine the switch which is wired into mine.

Oh yeah, I forgot to mention that... in addition to the converter I linked to above, I also had to wire the -5v out from the power supply. The ps in the Neo 29 does have a -5v output though, so it's really easy to do - just run a wire from the ps to the appropriate pin on the harness and you're good to go.
 
OK...

Let's lay these myths to rest. First, Neo Geo cabs:

If you have a Neo Geo cabinet wired for "MVS", which means wired for stereo audio, you CANNOT plug a JAMMA board into it directly. You MUST use an adapter or rewire the cab. If you do not, you will blow the audio amplifier chip.

They will get finger blistering hot then die.

MVS wired cabs include: 2 slot, 4 slot, and 6 slot cabs, along with 1 certain 1 slot cabs. If you have a 1 slot cab, look to see if it's running in stereo mode then check the wiring for the speakers at the board edge connector.

Next: -5v

If you have a JAMMA board that DOES require -5v AND you plug it into a cab that does NOT have -5v then you will have audio problems. Some boards (Midway makes some of these as do some others) require -5v for the audio op-amps and if it's missing, so will be the audio.

If you have a JAMMA board that does NOT require -5v AND you plug it into a cab that DOES have -5v being supplied to the board NOTHING BAD WILL HAPPEN. The JAMMA standard reserves 2 pins for -5v. If the board you have is truly a JAMMA board then it will either use the -5v if it needs or if it doesn't the edge connector pads for -5v will not have any traces leading from them.

Yes, I've heard (not witnessed) that there are some boards that will have bad things happen if the -5v is not there. I've heard (not witnessed) that 4116 and older tri-voltage DRAMs will die if they aren't powered properly. I DO NOT know if that is fact or not and will let someone else with that experience chime in.
 
OK...

Let's lay these myths to rest. First, Neo Geo cabs:

If you have a Neo Geo cabinet wired for "MVS", which means wired for stereo audio, you CANNOT plug a JAMMA board into it directly. You MUST use an adapter or rewire the cab. If you do not, you will blow the audio amplifier chip.

They will get finger blistering hot then die.

MVS wired cabs include: 2 slot, 4 slot, and 6 slot cabs, along with 1 certain 1 slot cabs. If you have a 1 slot cab, look to see if it's running in stereo mode then check the wiring for the speakers at the board edge connector.

Next: -5v

If you have a JAMMA board that DOES require -5v AND you plug it into a cab that does NOT have -5v then you will have audio problems. Some boards (Midway makes some of these as do some others) require -5v for the audio op-amps and if it's missing, so will be the audio.

If you have a JAMMA board that does NOT require -5v AND you plug it into a cab that DOES have -5v being supplied to the board NOTHING BAD WILL HAPPEN. The JAMMA standard reserves 2 pins for -5v. If the board you have is truly a JAMMA board then it will either use the -5v if it needs or if it doesn't the edge connector pads for -5v will not have any traces leading from them.

Yes, I've heard (not witnessed) that there are some boards that will have bad things happen if the -5v is not there. I've heard (not witnessed) that 4116 and older tri-voltage DRAMs will die if they aren't powered properly. I DO NOT know if that is fact or not and will let someone else with that experience chime in.

the most horrifying sound I've heard in my life is a Midway game without -5 present. oh my god.

thanks for the info, as always. :)
 
well its pretty easy

might explain why my mortal combat had no working sound.
I have 3 of em, I got a lot of boards to retest now after i fix the -5 volt option


OK...

Let's lay these myths to rest. First, Neo Geo cabs:

If you have a Neo Geo cabinet wired for "MVS", which means wired for stereo audio, you CANNOT plug a JAMMA board into it directly. You MUST use an adapter or rewire the cab. If you do not, you will blow the audio amplifier chip.

They will get finger blistering hot then die.

MVS wired cabs include: 2 slot, 4 slot, and 6 slot cabs, along with 1 certain 1 slot cabs. If you have a 1 slot cab, look to see if it's running in stereo mode then check the wiring for the speakers at the board edge connector.

Next: -5v

If you have a JAMMA board that DOES require -5v AND you plug it into a cab that does NOT have -5v then you will have audio problems. Some boards (Midway makes some of these as do some others) require -5v for the audio op-amps and if it's missing, so will be the audio.

If you have a JAMMA board that does NOT require -5v AND you plug it into a cab that DOES have -5v being supplied to the board NOTHING BAD WILL HAPPEN. The JAMMA standard reserves 2 pins for -5v. If the board you have is truly a JAMMA board then it will either use the -5v if it needs or if it doesn't the edge connector pads for -5v will not have any traces leading from them.

Yes, I've heard (not witnessed) that there are some boards that will have bad things happen if the -5v is not there. I've heard (not witnessed) that 4116 and older tri-voltage DRAMs will die if they aren't powered properly. I DO NOT know if that is fact or not and will let someone else with that experience chime in.
 
Channel Does this do it?

Channel tell me what you think about this one.
See attached pdf.
This is currently how my cab was wired by previous owner.
i called him today and he sent this over.
ok crap to big of a file..
lemme see where i can host this.

OK...

Let's lay these myths to rest. First, Neo Geo cabs:

If you have a Neo Geo cabinet wired for "MVS", which means wired for stereo audio, you CANNOT plug a JAMMA board into it directly. You MUST use an adapter or rewire the cab. If you do not, you will blow the audio amplifier chip.

They will get finger blistering hot then die.

MVS wired cabs include: 2 slot, 4 slot, and 6 slot cabs, along with 1 certain 1 slot cabs. If you have a 1 slot cab, look to see if it's running in stereo mode then check the wiring for the speakers at the board edge connector.

Next: -5v

If you have a JAMMA board that DOES require -5v AND you plug it into a cab that does NOT have -5v then you will have audio problems. Some boards (Midway makes some of these as do some others) require -5v for the audio op-amps and if it's missing, so will be the audio.

If you have a JAMMA board that does NOT require -5v AND you plug it into a cab that DOES have -5v being supplied to the board NOTHING BAD WILL HAPPEN. The JAMMA standard reserves 2 pins for -5v. If the board you have is truly a JAMMA board then it will either use the -5v if it needs or if it doesn't the edge connector pads for -5v will not have any traces leading from them.

Yes, I've heard (not witnessed) that there are some boards that will have bad things happen if the -5v is not there. I've heard (not witnessed) that 4116 and older tri-voltage DRAMs will die if they aren't powered properly. I DO NOT know if that is fact or not and will let someone else with that experience chime in.
 
like???

you mention
but there are a couple of other differences too...
what other. I'm trying to figure out options of going back to stock then using this or adding the -5v and figure out this switch which is wired in already, but is reported to be incorrect in the config per some members.

I use one of these in my Neo 29 to play jamma stuff:

http://www.jammaboards.com/store/jamma-to-neogeo-adapter/prod_228.html

The main difference is the sound (Stereo -> Mono) but there are a couple of other differences too...
 
I'm the member referenced in his first post that he'd been PMing.

I can't believe I forgot to mention it before, but an adaptor is a nice way to go, because then you can switch between the two at a moment's notice with very little effort, instead of having to change the harness each time you want to change between the two.

Collin
 
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