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case conversion

Can someone tell me how to convert character cases in Franz?  E.g.,
switching all to upper case or all to lower case.  I want to do this on
command, so I don't want to change the reader syntax to convert everything
to upper case automatically.  Franz gives a function for going one way,
namely (ascii), but I'm stuck about going in the other direction.
A speedy reply, either positive or negative, would be appreciated.
--tallis@a or tallis@ml