space invaders help

knight rider

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Game was working perfect for a long time, turn it on the other day and have this on the screen. I checked all votages they are all correct, slam switch not touching, and you can coin up, play, and hear the sound no problems, just the display is all messed up.

Any ideas?
 

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ok, weird I turned the horz hold and that did it, back to normal. Funny I say because game has never moved or anything and its out of wack, plus I tried that earlier before I posted for some help. I would think it would have got out of wack if you move the game or shift it or something, but hasnt moved in a long time.

>>Thanks guys for the input
 
Components drift with age and use. Capacitors, resistors, etc. Space Invaders is over thirty years old and that monitor has been on for countless thousands of hours. Can't stay perfectly adjusted forever.

-Ian
 
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