Quoted from Xtraball:
Awesome! I would think 7 digit score displays are necessary too then? When in 2x or 3x scoring, does the game indicate that somehow?
It blits a 2 or 3 depending on scoring level into the left part of the ball in play display. Normal play ball in play display shows 1 (where is blank and 1 is the ball in play, or 2 or 3, etc.) - when multiplied scoring, that display shows 2_ or 3_ for 2x, 3x, blanking the ball in play but flipping back and forth. It is 7 digit, and requires a level 7 mpu board. It's a complete rewrite of the game into the newer (blue) OS rom using information from: http://gamearchive.askey.org/Pinball/Manufacturers/Williams/PinBuilder/text/williams_lvl7_programming.html#compatibility
Quoted from Xtraball:
Ok so I’m in for this. Who can I pay to do this for me? I have a tendency to screw things up just by looking at a pin and THINKING about modding it. I’m in CT, I’ll drive the game up to 4 hours one way to get it done!
http://www.pinball4you.ch/okaegi/pro_d7f.html is how you physically install the new display set. The wiring for the 2x/3x version's displays may or may not be different than that, I'll have to double check, but the sound board wiring definitely is. You have to make a short new harness to plug your sound board (and commas for the displays) into the upper right connector on a system 7 board. The software referenced on that page is yet another version, which doesn't have 2x/3x scoring, but some other kind of gameplay with "missions" during multiball.
dothedoo and gizmonic both have this installed in their firepowers (obviously I do too) - Bill's was at the Texas Pinball Festival either last year or the year before it.
It's definitely not plug and play.... if you had a head harness for the displays from a parted out system 7 you could use that instead of modifying what's there.
The hardest part is mounting the credit/ball in play display properly. The other 7 digit displays all use 2 of the same mount points from the removed 6 digit displays. Luckily on the 4 or so machines I've changed displays on I've been pretty lucky in getting that alignment correct. (Flash, Timewarp, and TriZone are the other 3.... TriZone I've never broke 1,000,000 on for some reason I used to kill that machine in 1980 but now, nope.)
display-sound-signal harness diagram copy (resized).png