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volts). Read-only means that, unlike the case with conventional memory, the programming cannot be changed (at least not by the end user).
A typical PROM comes with all bits reading as 1, burning a fuse during programming causes its bit to read as 0.
Such PROMs are used to store programs permanently. They are frequently seen in computer games, or such products as electronic dictionaries, where PROMs for different languages can be substituted.
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