Jamma to Mame

[Jollywest]

Hi,

This is my first post on BYOAC and would just like to say . . . Hi.

Great Site by the way.

So... as the title suggests I am converting a standard 3-button Jamma cabinet to MAME. I'm pretty sure from what I've read on this forum and elsewhere that I know how I'm going to to this, So this is more of a confirmation of knowledge post. Please let me know if anything smacks of bad/unsafe practice. I'm also trying to keep this as simple as possible as even thought I have MAME running on an arcade cabinet I built from scratch, I'm a total beginner at interfacing into the components of a Jamma Cabinet. Therefore, I will be using a J-Pac and ArcadeVGA card from Ultimarc to connect the Jamma Harness to the MAME PC.

Here is the Cab


The Jamma PCB installed is Pocket Gal Deluxe. I've adjusted the pots on the Remote board and the Neck board, which has sorted the colour out slightly but still isn't fantastic but I can't get rid of a slight screen wobble mainly on the left. I guess since this monitor has a degauss loop a manual degauss wouldn't fix the colour issue, so I'm thinking a chassis recap is needed with this Cap-Kit > Hantarex Polo Cap Kit < as I'm 99% sure that the Monitor is a Hantarex Polo/2, and if so Is it right that these monitors discharge themselves automatically? (I do plan to manually discharge the monitor as well, just in case)

One issue I had is that for some reason I seem to have the Remote cable for a Hantarex Polo 1, so I had to adjust the pots without being at the front of the cab.

Does anyone know where I can get a Hantarex Polo/2 Remote Cable from?

The pictures below show the Coin Mech/Jamma PSU and Switches (1 on the back of the cab and 1 behind the Jamma PSU)

The plan here is to connect a plug onto the white cable coming down from the monitor (on the 1st pic), plug this into a anti-surge 4 way gang and wire the gang up to the switch behind the Jamma PSU, There is no isolation transformer in the cabinet and am I right in believing that the Hantarex Polo/2 will not need one? The PC/New Marquee light (as there isn't one) and new speakers (removing existing single 8ohm speaker) will also plug into the 4 way gang. I then plan to remove the Jamma PSU (as I've read this can cause issues with the J-Pac) and wire the coin mech up to a spare 4-pin molex connector from the pc. Would I be right in presuming that even though it is a multi coin mech that the J-Pac would just see this as 1 credit per coin no matter what the coin is?

Externally I plan to add 3 more buttons per player, 2 configuration buttons on the front, new joysticks, bezel, marquee, locks, T-molding and give the cabinet a full re-paint.

Does this all sound quite feasible? Please let me know if I'm on a collision course with the A & E ward.

Thanks for looking.

[BobA]

Lots of questions.  Try for a few answers.

Jpac and arcadevga is the standard way to interface a jamma cab to your PC.

The pic of your monitor looks like something is shifted.  Proabably needs a cap kit.

The coin mech will provide 2 inputs to the jamma harness.  coin 1 and 2.  Not sure why you are referring to a molex connector but it is the jamma connector that directs the coin inputs to the proper place.    If the molex is part of the coin door wiring it is OK if it connects to the jamma connector properly.

Cannot help re the Polo remote cable.

You can remove the cab Power Supply as it is not required for this application.

Could not follow all the gang this and that of your AC wiring but if you want to have your cab turn on with one switch you need a smart power strip that your pc can plug into to control all the other AC feeds.

[Jollywest]

Hi, Thanks for the response.

Most of the monitor related questions have been answered over in the monitor forum by Grantspain (< hero), which is probably were I should of posted them originally.

I plan to use a J-Pac but I've got a Radeon HD 4550 i'm going to use for the GPU and use program - Soft 15khz.

The coin door only has 1 coin slot insert and has 3 wire's coming from the back of it. 2 went to Jamma PSU (+12v and GND) and 1 goes to Jamma Harness. I thought I'd have to re-connect the +12v and ground to a spare 4 pin molex coming from the ATX PC power psu. Is this not the case?

 

[BobA]

+ 12V and ground are for the lighting the actual coin switch just needs gnd and a wire going to the jamma.

[Jollywest]

Ok thanks.

Think I will try to use the light as well.

Would this work;

+12v cable and ground cable going to pc psu for light with coin switch cable and ground cable going to jamma harness

[BobA]

Should be OK.  The ground is the same one for your PC and jamma harness if the arcade PS has been stripped oout.