OK I am doing something wrong here ( I think )

I've taken a PHP website package database written for MySQL
and converted it to FB1.5. Usual problems with BLOB, TEXT
and LONGTEXT, but I don't worry about those. The sticking
point is the use of UNIQUE. There are several VARCHAR(255)
strings with a UNIQUE key set. I SHOULD be able to do that
with a simple ascii string - shouldn't I? It complains that
the key is too long - so what am I missing, I thought that
255 characters was OK. If not, how do I get round this?

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Lester Caine
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L.S.Caine Electronic Services