(Topic ID: 110548)

Calling Cyclopes Owners - Please Help

By viperrwk

4 years ago

Topic Stats

  • 15 posts
  • 6 Pinsiders participating
  • Latest reply 4 years ago by viperrwk
  • No one calls this topic a favorite


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#1 4 years ago

Dear Cyclopes owner -
I am in the process of helping out Ronnie with his non-functioning MPU board (https://pinside.com/pinball/forum/topic/cyclopes-pinball-shop-out-restoration-thread). He was getting no flashes from the LED on the board and sent it to me for help.

One of his problems was that he had a bad 6551 RAM (since swapped out) but his LED is locked on solid.

After more investigative work, I discovered that for whatever reason, the board keeps getting hung up during boot with the 2732 game ROMs installed. When the board is reconfigured for 2716s, it boots and plays fine.

I unfortunately have no documentation on how this board should be cut and strapped for 2732s (which is the size of the ROMs in Cyclopes). So if a fellow Pinsider can help me - and Ronnie - out...

If you are an owner of a functioning Cyclopes, I would very much appreciate a photo of both the front AND back of your MPU board, including any detail of any jumper wires or any noticeable cuts on the board. It will require you to remove the board from your machine to take the photos.

I'm probably missing something obvious but sometimes you stare at schematics long enough and you stop seeing things, so I'm hoping someone can help us out.

If you take some photos feel free to either post or PM me.

Thank you!


#2 4 years ago

Help me get my Cyclopes working! Somebody post some pics please!

#3 4 years ago

I forget the pinsider's handle, but someone brought a working one to pinball at the zoo 2014. Maybe he can help getting pictures.

#4 4 years ago

I know one person that has one. I pmed him. He is out of town but he said he would be able to snag some pics when he gets home.

#5 4 years ago

I e-mailed the owner of the one that was at PATZ/Expo with this link.

Good luck.

#6 4 years ago
Quoted from PinballJeff:

I e-mailed the owner of the one that was at PATZ/Expo with this link.
Good luck.


#7 4 years ago

Getting more than one set of shots would be a good thing.

Most GP pins used 2K ROMs (2716 equivalents). Cyclopes is unique in that all three ROMs are 4K (2732 equivalents), though the last one (U26) is mostly blank, padded out to fit a 4K ROM, probably to standardize and keep costs down. U26 is where the sound calls are located and since Cyclopes has a microprocessor-controlled sound board, there didn't need to be much there.

The MPU board was never designed for 2732s but the schematics show that it can be cut and strapped for TMS-2532s (TI's take on the 4K EPROM). The pinouts are different between a 2532 and a 2732. So the board had to be modified to take the 2732s, which I imagine was cheaper than TI's 2532 and is why it was in this particular board. It also shows that GP was pushing the limits of what they could do with their games. I imagine knowing the development cost of a new platform to stay competitive was but one of the reasons why they folded up shop.

There are two different ROM versions for Cyclopes - they are very close in that there are only a handful of bytes difference between the two versions. In fact, the date embedded in both sets is the same - August 26, 1985. Which is over two months before IPDB lists the game's release.

Thanks to the one person that has said he would help. Like I said more shots would be a good thing. Regardless, some interesting background info to support the bump...


#8 4 years ago

Wow - really cool info on the GP MPU setup. Hope you're able to source some pics. It really seemed like game plan was hitting there stride when they folded.

#9 4 years ago

Did any Game Plan games have speech?

#10 4 years ago
Quoted from noahpdavis:

Wow - really cool info on the GP MPU setup. Hope you're able to source some pics. It really seemed like game plan was hitting there stride when they folded.

Loch Ness looked awesome, wish they woulda made that one.

#11 4 years ago
Quoted from Ronnie1114:

Did any Game Plan games have speech?

You'll be happy once your game is working correctly...


#12 4 years ago

Here are the pics: If you need any more let me know.

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#13 4 years ago

Who hoo! Thanks so much.

#14 4 years ago

To compare:

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#15 4 years ago
Quoted from schudel5:

Here are the pics: If you need any more let me know.

Thanks so much! PM sent.


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