Gyruss help

Taco

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Can anyone tell me how to put this game into test mode? I have 16 bars running across the screen, I believe it's due to bad video ram.I also need to know what ram to buy as alot of the chips have been marked over so you can't read them.
 
There is a switch mounted on the inside of the coin door near the hinge...
 
Konami sanded the tops of the chips to make them harder to bootleg. Look at the schematics and it will tell you what rams you need. If I recall there are 2114's but not sure what other (if any) rams are used on them.
 
Konami sanded the tops of the chips to make them harder to bootleg. Look at the schematics and it will tell you what rams you need. If I recall there are 2114's but not sure what other (if any) rams are used on them.

Thats my problem I don't have or know where to get the schematics. Any ideas where I can find it online.

Thanks for the help guys.
 
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