The 2 differences I have found with the two bits MPU vs an original MPU (& have read that other people have the similar issues with) was the two bits boards were shipped with a 4049B at U14 when it should be a 4049UB - which will quite often cause feature lamp strobing & for some reason they are slower to tally up the playfield score & the bonus countdown.

I noticed on my two bits MPU that it was shipped with a ceramic capacitor at C16.

I removed the ceramic C16 & replaced with a polyester cap - now the MPU runs perfectly & no longer running slow.

Certainly worth changing the C16 cap to polyester if the op's is a ceramic & see if it makes a difference.

I was wondering this too as I was thinking of buying a bare board & assembling one, then I saw an ebay seller selling the bare boards had a component list attached.

https://www.bobsokol.com/ebay/dash35/DASH35BOM.pdf

That's good to know - all my 7 digit Bally games have the same quite noticeable flicker compared to no flickering on all the 6 digit games.

I wondered about the cause of the flickering on the 7 digit games before & sent Tom Callahan from the Repairconnection an email about it about 20 years ago. He replied suggesting to change the R22 resistor from a 4.7K to a 1K to increase the display interrupt generator from 300Hz to 350Hz.

I forgot & never go around to trying it.

Here is one of the later MPUs as can be seen dated ‘84. This has a factory 24k resistor at R21 & trying this board in a Flash Gordon their is no flickering with the displays, No flickering with the two bits mpu either.

FA70044B-2B91-4A8D-9CDD-FE93F3A2786A (resized).jpeg