\setuppapersize     [A5][A4]
\setuplayout        [backspace=2cm,width=middle,
                     footer=0cm,margin=1cm,
                     location=middle,marking=on]
\setuppagenumbering [alternative=singlesided]
\setupbodyfont      [lbr,6pt]
\setupheadertexts   [alfa][beta]

\showframe

\starttext
  \dorecurse{10}{\input tufte \par \input knuth \par}
\stoptext
