Just a side note on these Twobit Dash 35 boards.

If you find you have any feature lamp flickering going on with standard incadescent globes installed for feature lamps (regardless of which game you use this "Dash 35" board in) you need to check U14 is a 4049UBE & not a 4049B.

Some or all of these Twobits "Dash 35" MPU's were shipped with a 4049B at U14 when it should have been a 4049UBE. All the Bally boards were shipped with a 4049UBE (even though the manuals state 4049B at U14). A 4049B at U14 will cause very noticeable flickering on some feature lamps.

I swapped mine out to fix this problem.

Probably a good idea to get rid of that Nicad battery too before it leaks.

No worries, yes, I found their was very little info about this. Definitely change the U14 to a 4049UBE & see, looks like yours is nice & easy as it's socketed - mine was soldered in.

Ah ok, even though it'a a 4049UBE present, I would probably change it for another different brand 4049UBE to rule out U14 in case the problem is with that chip or the brand of chip. They are cheap. I would check the socket is ok too. I used a CD4049UBE.

A post on a similar problem here & other possible solutions- may be of some help.

https://pinside.com/pinball/forum/topic/bally-controlled-lamps-flicker

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