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In ROM we use semiconductor devices only then how data in that doesnt get erased even we power off it?
Because the data on a true ROM chip is batch encoded at the factory and will never change (unless you let the smoke out).
It's kind of like scars. They don't really dissapper when you turn the lights off.
Basic research isn't difficult...
http://lmgtfy.com/?q=%22read+only+memory%22
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