What if you roll a score(s) over and it beats the high score, does it show the extra segments in attract on all the displays when it shows HSTD? I don't even remember exactly how the HSTD works on these as per rolling it over past 999999, I don't have my 6-digit Eight Ball anymore. Probably wouldn't indicate anything additional anyway but what the heck.

When you tried it with 7 digit displays and it did the same thing, you mean it was same bug for 10K and 100K digits except the 1M digit stayed at zero?

It's as if a phantom 7th digit '1' b and c segments somewhere are affecting other b and c segments. Again, as if. Is there any change at all if you roll a score over 5 or 6 more times as if it is 5 or 6 million? Dunno how these store the roll over status, since it seems to keep track of it given the way they won't store a rolled over score for HSTD. Just a data bit, or a digit value, or (?)