\pdfoutput=1

\pagewidth=210mm      % needed for \pagedir R** or *R*
                      % for proper placement distance
                      % from the right page edge

\pageheight=297mm     % needed for \pagedir B** or *B*
                      % for proper placement distance
                      % from the bottom page edge

% but in any case \pagewidth and \pageheight are needed
% to define the page dimensions

\pagetopoffset=1in    % needed for \pagedir = T** or *T*
\pagerightoffset=1in  % needed for \pagedir = R** or *R*
%\pageleftoffset=1in   % needed for \pagedir = L** or *L*
%\pagebottomoffset=1in % needed for \pagedir = B** or *B*

\hsize=8cm
\vsize=8cm

\bodydir RTR
\pagedir RTR
\pardir RTR
\textdir RTR

1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9

\bye