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Do you want to compare single characters, one at a time or ascii strings ?
That distinction makes a big difference.
If single characters are to be compared for presence in a ROM, then you can use the incoming ascii code as the ROM address. If this character is legal, the rom should output some value ( one for instance), else it should produce an opposite value ( zero for instance ).
In the latter case when you are going to compare strings, some more advanced concepts should be employed depending on the requirements of your project.
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