centipede chip id number help needed

kuglerarcade

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when i went to play game i got part of the game on screen and a,s all over it as well.so i did self test i got 3 beeps that tells me k7 ram is bad looking at chip id its says its a 90-7018 ramdom access memory.i did a search for this to order one .i had no luck. does any one know the replacement number or a chip that will replace this or any other ideas would be appreciated thanks
 
If those RAMs are socketed, I would try swapping the bad one with another one to see if the problem moves with the RAM or stays with that previously reported position.
 
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