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:
"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
#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.