Atari Dunk Shot to Tehkan World Cup Update 1

 Arcade Info  Comments Off on Atari Dunk Shot to Tehkan World Cup Update 1
Apr 022018
 

My conversion of Dunk Shot to Tehkan World Cup is going fairly well.

Firstly the external work on the cabinet is complete and ready for the artwork.

Here is a picture of where things are currently at:

Tehkan World Cup

Tehkan World Cup

The cabinet has been painted and has t-moulding fitted. The coin door has been coated and re-fitted, and the control panels have been mounted and screwed into place after also being coated.

After the artwork has been applied, the next steps will be to work on the internal parts of the cabinet. Fitting a monitor, power supply, game board and trackballs etc. Luckily I now have a working game pcb to mount in the machine:

Tehkan World Cup PCB

Tehkan World Cup PCB

Vs. Goonies/Gradius PCB

 Nintendo Vs  Comments Off on Vs. Goonies/Gradius PCB
Apr 022018
 

I’ve been busy working on a reproduction Vs. Goonies/Gradius daughterboard for the Nintendo Vs. system.

There were complexities to this PCB because it uses a custom VRC chip, which are not easy to find, and there are no schematics for this board so it was a case of tracking down an original PCB, and mapping out all the pinouts. The great thing is that this PCB will be a lot less than an original PCB, so it makes it cheap and more available for the people that would love to own it, like myself 🙂

This is the circuit diagram I produced using Eagle:

Vs Goonies PCB

Vs Goonies/Gradius PCB

The boards arrived from manufacture to be tested:

Boards Arrive

Boards Arrive

Early version of Tehkan World Cup

 Tehkan World Cup  Comments Off on Early version of Tehkan World Cup
Jul 292017
 

I’ve been working on trying to fix an original Tehkan World Cup PCB for quite some time, but not making much headway.

What has been really interesting about this repair is that I have discovered that the majority of the roms on the main CPU board were not known in Mame. Sometimes this is just a case of the rom data being corrupt, but I have managed to run the game data in Mame, and it looked fine, so that ruled that possibility out. What I noticed is that it was different to the version I had previously seen. I compared the two side by side so you can see the differences yourself. You’ll notice that the logo looks different and there is no world cup image in my version:

YouTube Comparison

With the help of another collector I submitted the rom data to the Mame team and it turns out that this is an early version of the game and even has a different way of handling the dip switches.

The information that was added to Mame can be seen at the page below:

Mame Tehkan World Cup Info

I also submitted some pictures of the CPU and video board to the Mame team so they were aware of any markings on the board which might provide some more information:

Tehkan WC CPU Board

Tehkan WC Video Board

Tehkan World Cup Pinout

 Tehkan World Cup  Comments Off on Tehkan World Cup Pinout
Jun 032017
 

I’ve started to take a look at an original Tehkan World Cup PCB in order to start to get the electronics side of things done before I move onto the conversion of my empty Atari Dunk Shot cabinet to a Tehkan World Cup cabinet.

The PCB itself was filty when I dug it out of the loft so I decided to give it a good clean. Whilst I was waiting for it to dry I started having a look on the Internet for pinouts so I could wire up a Jamma adaptor.

I came across two possible pinouts. One on Andysarcade.net and the other on Powerstrike.net.

Andy stated on his website that the powerstrike pinout was incorrect. I found this was partly true, as the pinout was correct but the wrong way round e.g. A and 1 was really V and 18 according to Andy’s list. In fact I believe they both use the wrong labelling for the connections because the PCB is labelled B1-B18 on both connectors on the parts side, and I suspect that the solder side is classed as A1-A18, so that’s what I’ve used with my attempt of the pinout. The connectors are also labelled J1 and J2 on an original PCB so I’ve also made that clear on my diagram. Hopefully it makes more sense?

Tehkan World Cup Pinout

Tehkan World Cup Pinout

I’ve yet to confirm my wiring is 100% but I’m fairly convinced it is. I will give an update on this when I’ve done my Jamma harness. I have used the Tehkan World Cup manual I have on my site which can be found here. The only problem with the manual is that it is not the most readable as it looks like it has been photocopied over and over, but it seems to be the only one on the Internet!