(Topic ID: 235434)

Rottendog mpu011C (williams) difference from mpu004 (data east)

By rpageler

8 months ago

Topic Stats

  • 8 posts
  • 4 Pinsiders participating
  • Latest reply 3 months ago by athens95
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#1 8 months ago

I have a rottendog mpu011c that is the basically the same as a mpu004 as far as i can tell. I tried to use it in my data east rocky and bullwinkle without any luck. I've double checked the dip switches for data east. Is there anything i can change on the board (jumper, chip, etc) to enable it to work as an mpu004 (data east) board?
appreciate your help.

#2 8 months ago

Not sure if this will help as it's original Williams (not Rottendog) and the reverse (using DE in Williams) but it does contain some information about the differences. Williams System 11 and Data East (MPU revision 3 or 4) are essentially the same board with some differences. Identifying the differences and bridging them should make it work.


#3 8 months ago

Thanks! i'll check it out.

#4 8 months ago

From the original rottendog description of the board:

"This board is the same basic board as our part number MPU004; However, slight modifications (jumpers, pin clips) have been made to make it exactly the same as the original Williams / Bally board."

I wish they listed the differences.
Found this info as well:

from https://groups.google.com/forum/#!topic/rec.games.pinball/6Xa1fUiXsIY

"So where I am at at the moment is to use an 11B or 11C board in a DE
#1 replace the RAM at U25 with 6264 and jumper correctly,
#2 Modifiy the power connector in the DE game to match.
#3 Cut trace and add jumper to convert to single 27512 eprom (at U27)
for those games that need it.

The actions to accomplish these are

#1 To convert 11B and 11C to 6264 ram at U25, remove jumper W5 and
install it at Jumper W6
#2 Add a wire to pin 9 on the connector for J17 to supply 12V to the
board The schematic for DE matches williams with pin #7 keyed, but the
pictures of DE MPU's appear to show something different
Either way, Pins #1-3 are ground #4-6 are 5V and #9 is for 12V. -12V
isn't needed.
#3 Cut the trace from Pin 1 of U27 (it connects to 5V) and jumper it
to address line 15 (pin 25 of the 6808 CPU)

These all seem like minor enough changes to make it worthwhile to
convert an 11C board over to work in Data East games. If #3 is done
clean enough, it should be easily reversible back into an 11C with no
need to switch the RAM back."

Anyone done this? any success? thanks.

#5 8 months ago

You don't need to do any of that. The only thing you need to do is ensure J17 has pins 8 & 9 for MPU011C.

For MPU004, ensure the ROM jumpers are set properly for the size ROM you're using.

Nothing else needs to be done.

Rob Anthony
Pinball Classics
Quality Board Work - In Home Service
borygard at gmail dot com

#6 8 months ago

Cool. So ill change j4/j5 and fire it up.

4 months later
#7 3 months ago

Finally got around to this and no go. Swapped the jumper at j4/j5 and when started it makes a sound but no display, game doesn't start, etc. Are other steps needed or am i looking at a bad board? It has not been used.
Thanks for any help.

#8 3 months ago

I had the same issue. I took a williams board and put in a tales from the crypt. Basically powered up and played. But the DMD didn’t come up. So, possibly the only difference is in the display drive portion.

Too bad they are not the same.
I didn’t dig any further, figuring I just need to get the correct version

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