It seems the more I learn the less I know. I haven’t worked on many Bally games but I’m familiar with Stern games. Stern has two boards – MPU 100 and MPU 200. Easiest way for me to identify between them is the 200 has U13.
Bally has three boards – AS-2518-17 – AS-2518-35 and AS-2518-133. The 133 is an oddball only used in a few games so I’m not too concerned about it.
All this time I thought the 17 was like the 100 and the 35 was like the 200. I just found out that is not true. About the only difference between the 17 and the 35 is the number of pins on the J5 connector. (32 vs 33). My question is did Bally ever make a board comparable to the Stern MPU 200?