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.

Thanks! i'll check it out.

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
game
#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.

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

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.

So this has been a while. Now i have another machine i'd like to put the board in. I wrote Rottendog the following. Hoping someone on pinside knows the answer or can at least share the schematics for each board so i can look for the differences. Appreciate any advice.

Hi there!
I have an MPU011C and I was wondering if it is possible to change it to an MPU004 as I now have a different game I would like to put it in (Frankenstein). I have set the dip switches to DE instead of Williams, moved the CPU ROM and the RAM but it does not boot. Am I missing a step or is this not possible? There is a black check mark next to MPU011C on the board so that is the original configuration. I am comfortable with board work if this requires some chip changes, etc.
Thank you!
Robert

Heard back from rottendog: “ Sorry you cannot convert the board , it is not compatible”

Does anyone have the schematics for each they can post here or send me? Rottendog’s website does not have the schematics posted.