Quoted from AndyBadCatsUK:OK have just installed L2 version and notice an improvement but still a slight delay on the upper 2 way horseshoe 2 sec down now to 1 sec. I expect the delay is intentional. The attract display now shows hold over jackpot exact score don't remember seeing that in L1. Correct me if you have L1.
Game overall feels sharper.
I've also got the music and speech roms but not installed as I think there the same?
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By the way - it appears that your U25 is socketed - that means for <$20USD and 5 minutes of your time - you'd be NVRAM's and can toss your batteries!