(Topic ID: 292831)

Rottendog MPU004 latest version

By JP1973

10 days ago

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  • 3 posts
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  • Latest reply 9 days ago by JP1973
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#1 10 days ago


I just received my new MPU from Rottendog. It's the newest version, fabricated in Mar 21.
I wanted to use it in my Data East Jurassic Park 1993.

I have an issue with the board. At first, there is an extra Pin at connector CN17. I removed the pin in agreement with Huperballs, the distributor for the Netherlands.
Then, after swapping the CPU and the Gamerom, I installed the MPU. And.... it makes the dino roar, but then nothing. Just the led 5v/Pia are lid. Nothing Else. The original MPU works but now and then it will reset or freezes.

Does anyone have experience with this new board and a Data East pin?

When i look at the new MPU there is a difference in the Lay-Out. It doesn't have the switch like the earlier MPU. Instead it has a soldered Jumper for 512 K and the other kind. Maybe it's meant to cut one Jumper?

Many thanks for the one who will respond on this topic.


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#2 10 days ago

They did a confusing job. In stead of mentioning "RAM" it should be "ROM" or "EPROM". In your case you should cut/remove J4: No ROM installed at U28, and a single 512kROM installed at U27 (27512 Eprom).

#3 9 days ago

Weel, i got the permission von Rene Timmer, Hyperballs for cutting the Jumper J4.
And.... it works, booted immediately.

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