this is an annoyance rather than a deal breaker, but why does
this file generate a blank page numbered one and then the table?

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\setuppapersize[letter]
\setuplayout{margin=0.5in,topspace=0.5in}
\starttext
\startstandardmakeup[doublesided=no]
\bTABLE
   \setupTABLE[frame=on]
        \bTR
        \bTD foo \eTD
        \eTR
 \eTABLE
\stopstandardmakeup
\stoptext