K7600 .:. Medium Resolution (25khz) .:. MAME

[vtn]

Chello...

I have recently purchased a Gauntlet Legends (showcase - 39") to turn it into a MAME machine.  My challenge in this conversion is connecting the VGA to the medium resolution monitor.  I have purchased a ArcadeVGA and breakout cable and have spent countless hours in trying.  In staying up late for several nights for several weeks, I have cried mercy.

I have ordered a Universal Video Converter from Suzo Happs early last week.  In this past week I have been getting conflicting information that this board is on back order, will be sent and most recent, they are ceasing production and now canceling my order.  As I have scoured the Internet for any other success to connect PC to any type of resolution, I have not seen any other results outside of using another monitor.  I prefer not to have to do this.


So in my plea, has anyone have any success connecting a PC to a WG K7600 (or perhaps any medium resolution) monitor for MAME?  I have read the few people on this board that have built/converted a Gauntlet Legends to MAME.  Hopefully, someone can provide me direction.


My sincerest appreciation for your help,
vtn


Core Duo 2.4GHZ, 4GB RAM, 320GB Hard Drive, ArcadeVGA :: AdvancedMAME :: Gauntlet Legends (showcase) 39"

[vtn]

I apologize.

To describe the specific issue, when connecting the PC to the (medium resolution) monitor, the screen has several colored lines throughout the screen.  At one point, I was able to get AdvancedMAME to kind of show, as the image was more visible but duplicated.


Thanks.

[TOK]

I'm not familiar with your specific monitor, but isn't it switchable to standard res? I think I'd try getting it working in standard mode, then if you feel necessary work towards the medium res settings.

[northerngames]

I have that same rig and suggest stopping where your at before you damage it if you have not already.

if it is a true 39" it is a standard and medium display monitor switchable by harness swap.

I could help you with it but dont do anything more until you put it in the right mode first.

if you unhooked the remote board and powered it on without it connected then it already blew components on the chassis 

I would cancel the suzo board or any other converters as they are not needed all you need is the arcadevga the breakout cable & software and that is all.

[AndyWarne]

Agreed that if you can run at 15Khz it is much better to do so.
The ArcadeVGA does support two 25Khz resolutions, when you install the tri-sync utility. But these two resolutions will not give you very many native game resolutions, in fact only those games which originally ran on medium res monitors will be native res. So almost all games will need hardware stretch or D3D enabled. The results of this are not very good because stretching only works well when the monitor is a much higher resolution than the game, which its not.
Andy

[vtn]

Thank you for your responses and I do need your further help.  The manual it came with says its a Neotec NT-3500, NT3501 or NT3602.  However I am 99.99% sure it is a WG7600, due to the board configuration (and info from WG site).  With that said, I have had the monitor hooked back into the actual jamma board and it worked with Gauntlet Legacy (I updated the chipset and hard drive).  Nothing appears damagaed as of yet.

I have searched for information and tried studying the back of the monitor board to see how I could switch resolutions (even found a WG7600 schematic).  But, I can find any where to switch it.  If it is on the jamma board, any insight would be useful to locate it and to "flip" it the needed state.    From there I need a different harness?    Is there any advice where I would get such a contraption?    What model of harness do I need and what website could I obtain that?  Will that plug into the jamma board and then connect to my breakout cable?  (yes, this is where all my inexperience and ignorance is showing.  I have thrown myself into this world of arcades, in reliving my childhood  ).

Last question.    If I get a harness to plug into the board, will that allow me to play Gauntlet and the MAME and if so, how would I switch it?



Thank you for all your help.  Before these last replies I thought my vision to have a MAME on a big showcase system had ended.  I found myself lost in medium resolution purgatory.  Now, I see a light and I am heading toward it. 


vtn

[northerngames]

for the pc part just the arcadevga and the ultimarc vga breakout cable is all you should need for a pc to display on it.

if it is another type monitor beside's a well gardner K-7600 then you need to find out what it is for sure.

I have the 39" K7600 and can help if yours is the same.

is you cab made by atari or dynamo?

atari's were the smaller 33" look alike models.

[vtn]

The outside says it is Atari.  In measurement, the monitor is the larger one, not 33".



Since you have a K7600, were can I look (take a picture) to see/show it is?  The monitor board layout is exactly the same as americangaminginc posts on their website: www.americangaminginc.com/spotlight/shortform_cat_web.pdf on page 122. 


Thank you for your help.  I am excited someone else has the answer and willing to share!

[northerngames]

its a 33" atari did not make the 39" dynamo did and they used the K7600

are you measruing it from left to right or top to bottom or on a diagnal corner to corner?

is your cp 48" wide from the farthest 2 points?

[vtn]

the monitor is about 30.5" wide and about 24" tall

[vtn]

I should point out this is the monitor edges, not cabinet edges....



Thanks.

[northerngames]

measure from bottom left corner to top right corner of the farthest corner points of your monitors screen.

monitors screen size is not measured from left to right or top to bottom.

[vtn]

Measring around 38", 39".  Having my wife take a picture as we hold it to show exact.  Post in a couple minutes.

[vtn]

My wife had to hold the top diagonal right as I held the bottom and took the picture.  It appears it is a 38".

Again the monitor board represents a WG (though I am unsure why the manual I received when I purchased the game says Neotec).


I saw there are some dipswitches on the jamma board (U12) that I can change medium resolution to standard resolution.  Once I do that, what is the best option to connect the VGA from the PC to the jamma board?


Thanks.

[northerngames]

the monoitor chassis # is P-823

the duaghter board located where the gameboards are usually is part # P-804 I think but need to look again.

[vtn]

The above picture was snapped from the back of my monitor.  In case this can't be read (apologies, if this is true), the model is: WGEC 088X0432-001.


With that said, how do I connect VGA from ArcadeVGA to the jamma board on the Gauntlet Legends?

[northerngames]

I dont know how jamma is setup so I could not help with that you may want to check into the J-pac made by ultimarc though.

connecting a pc to the monitor I can help with no problem.

also if you flip the gameboard to output 15K that is fine but dont expect the monitor that is set for 25K to display it all that does is change the games output to 15k but does not mean the monitor has changed to accept the 15K while it is still in 25K mode.

you need to swap the harness on the monitors chassis from 25k mode to 15K mode

it should be toward the front of the chassis if looking at it toward the rear and it is kinda in the right center area it is actually located in the worst place possible to get to access to it from the rear of the cab to be honost.

 I had to use a little mirror to find mine and the correct setting becuase the location is so hard to access from the rear.

[vtn]

Thank you for all your help.  I am not trying to be dense (though I know I am), where would I find a 15khz monitor harness at?  I never heard that before.  Is that something that I can get from Ultimarc or some other vendor?



Thanks.

[northerngames]

its a big white plug on your monitors chassis that needs to be swapped you will need to pull if off the high aka 25k settings pins and put it on the next set of pins wich is the low setting aka 15k.

if you were going to hook up the pc only you just setup your arcadevga card plug in the ultimarc vga break out cables to the card and the other end plugs right onto you monitors input signal pins.

first put the monitor in 15k mode before you add the arcadevga and breakoutcable and it should be good to go after you adjust the V-hold upon initial power-up after installing.

if you want to run jamma also check the ultimarc site and look into the J-pac pcb I dont have jamma and not use to setting them up so I cannot help with the jamma part sorry.

[vtn]

I wanted to say "thank you" notherngames  !!!  After this past week I have resolved all my monitor issues with your help (as well as some other analysis and testing).  After I proceeded to move the white cable from the 25mhz to the 15mhz on the monitor board, purchased a power cord from Wells-Gardner, and spent countless hours trying several different resolutions, tweaks and mame settings, all of my video issues (jittering, wavy display in mame) the picture is almost perfect (minus the known slight discoloration in the top left that I have used a degausser on). 

Often times thanks is missed as people get busy after they get their answers.  I just wanted to ensure I am highly appreciatitive of your help northerngames!


Thanks!