Hello Hans,
what is the purpose of \hexstringtonumber{..}?
I would expect something like:
\unprotect
\setvalue{@@uc@@a}{10} \setvalue{@@uc@@A}{10}
\setvalue{@@uc@@b}{11} \setvalue{@@uc@@B}{11}
\setvalue{@@uc@@c}{12} \setvalue{@@uc@@C}{12}
\setvalue{@@uc@@d}{13} \setvalue{@@uc@@D}{13}
\setvalue{@@uc@@e}{14} \setvalue{@@uc@@E}{14}
\setvalue{@@uc@@f}{15} \setvalue{@@uc@@F}{15}
\def\dohexstringtonumber#1#2% FF
{\the\numexpr\csname @@uc@@#1\endcsname * 16 +
\csname @@uc@@#2\endcsname\relax}
\protect
\starttext
\hexstringtonumber{1E}
\hexstringtonumber{f5}
\stoptext
But your version just adds a " to the string...
Cheers, Peter
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