SmashTV + Total Carnage + Mike's Double Jamma

[JeffC]

There's been some good Smash TV discussion here lately, so I'll add my latest project:


Here's where I reveal myself as a Jamma noob - I'm trying out the Mike's Double Jamma adapter. It seems to be a very well made item, and works perfect except for one glaring problem in that it doesn't pass pin 25 through. Not sure if that's described right, but the device seems to take all of the pins from the game harness, and "split" them, allowing you to connect both boards, then switch between them. When I hold the adapter up to the light, I can see that all of the traces that do this. Literally every edge pin on the harness side has a trail that splits and goes to each of the corresponding pins for the two boards you’re connecting…except for pin 25 (and its letter counterpart on the other side) which goes no where. In Smash TV, this translates to not being able to shoot right (direction right).

Starting from the left - 28 and 27 are grounds, 26 is for a button to switch between games, its going through a jumper and some other stuff. 25...nothing?!? I must keep all my enemies on my left side!! Then every other pin goes through various components and then to it's two counterparts on the othe connectors:

The only other issue I can see is that by default, you swap games by pressing P1 and P2 at the same time. In Total Carnage, the same button is used to drop bombs. I'm afraid that during a 2 player game, it might be easy to be bombing at the same time and accidentally swap games. I think the pin 26 button disables the P1/P2 swap function, but I'm not sure.

Other than that its fine…no issue with the video with my single power supply, or anything else. Anyway, I'm going to work on it more tonight.

I also want a mod that makes the Smash TV announcer say "SKATE OR DIE!!!"

[m_mcgovern]

Smash + Total Carnage in a single cabinet is a sweet set-up. I've seen others do it by swapping the boards back and forth, but these two were made for each other. Please keep me posted on this project.

[pseeds]

I was looking at doing this as well. Thanks for the info.

[slac]

I was wondering the same thing about the player 1 and 2 for total carnage. I was thinking of doing the same thing but total carnage is nowhere near as fun smash tv. Swapping boards does suck since you have to go through the back of the cabinet.

[jow]

Originally Posted by JeffC

Here's where I reveal myself as a Jamma noob - I'm trying out the Mike's Double Jamma adapter. It seems to be a very well made item, and works perfect except for one glaring problem in that it doesn't pass pin 25 through. Not sure if that's described right, but the device seems to take all of the pins from the game harness, and "split" them, allowing you to connect both boards, then switch between them. When I hold the adapter up to the light, I can see that all of the traces that do this. Literally every edge pin on the harness side has a trail that splits and goes to each of the corresponding pins for the two boards you’re connecting…except for pin 25 (and its letter counterpart on the other side) which goes no where. In Smash TV, this translates to not being able to shoot right (direction right).

Starting from the left - 28 and 27 are grounds, 26 is for a button to switch between games, its going through a jumper and some other stuff. 25...nothing?!?

Thanks for the info. I was going to use this for my MK/MKII setup but Im wondering if it will screw it up?

[dmbj]

I MUST finish up a few things first but you guys are making me pull my smash tv out and finish it. Now that I know where to get the CP overlay I can't wait to finish it up.

BTW: pin 25 is not used in the jamma standard. but there are a few boards that use it. I think Neo-Geo's use it for button 4 so maybe check out the Neo message boards for some info on this. When it is done and working that is gonna be a kick ass machine.

here is mine. when i got it, it was a golden tee

[m_mcgovern]

Originally Posted by dmbj

here is mine. when i got it, it was a golden tee

Wow. Already I can see your marquee is much nicer and not nearly as faded as mine...

[JeffC]

Success!!! – http://www.youtube.com/watch?v=vzmUgNVB3_Q

It turned out to be much more of a project than I anticipated, but I now have this working perfectly.

Issue one was the missing control to shoot right. This was remedied by soldering a wire to the Jamma adapter at pin 26 and c at the connection to the Smash TV board, then tying them to the outputs from the Total Carnage board as well as the main game harness.

The second was a sound issue that should have been simple, but took me forever. I wasn’t able to get sound to work with both games, through the same POT, which was how I kept trying to wire it. One game would work, and the other would be at full volume. In the end, I wired a second volume pot, and everything worked perfect.

Last was the switching function, which is done by pressing player 1 & 2 start simultaneously. Since these buttons are used for gameplay in Total Carnage, I opted to disable the P1+P2 switching, and add a small button through an existing hole in the cabinet.

On the left is the Smash TV CPU, with the sound board behind, and the Jamma adapter above. Going across is the Jamma cable that’s included with the adapter. On the right are the Total Carnage CPU and sound boards.


The adapter PCB, the blue and purple wires were added for the missing “shoot right” control.


The extra volume pot I added, and the small button to switch between games on the right, just outside the coin door.

Check out the video at the top of this post to see it working.

[pseeds]

Really cool. Thanks for sharing the info on how you made it work.

[m_mcgovern]

Very cool! Thanks for sharing the details...and...

Originally Posted by JeffC

Success!!!

nice picture with the Quantum peeking through the coin door, taunting us all!