This is my first post, so hi everybody from the UK. I am in my mid 60s and love my only pin Operation Thunder. I've had it 4 years now but its not been working for the last 6 months. Now having finally rectified the problem and fitted a new A3 driver board the game appears to all be working, although I have noticed the following possible issues ? and would appreciate any help or suggestions from the forum
First this message 8CD9 appears very briefly in player 4 score, only when m/c is first turned on. Also in self test [ which I've only dared try once ] under game prom check SUM 8CD9 comes up again.
Second the game seems to play slightly different, easy !! voice commands do play but don't always as I recall where they once did or as often !! some back box lighting for train and power plant explosions using the larger bulbs seem to not last as long or be as intense, all bulbs are working !!.
Are these issues related ? Can adjustments be made ? is my memory bad ? Could you please advise me ?
Finally I know nothing about electronics, I do have a multi meter, am practical, good with mechanicals and look forward to any and all help, instructions.
Many thanks.
Graham
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Bump

Thanks i will look into the possible grounding problems

Is 8CD9 brief display at mc turn on indicating a problem or fault ?

Sorry didnt get back to you but see Flip Wilson has posted you the picture
Thanks for your kind comments on my mods

Thanks pb456 Not sure i understand, but assume if this code remains the same, which it does, thats good.