\begin{quote}
\begin{tabular}{|l|c|l|l|}\hline
{\em Opcode} & {\em Fmt} & {\em Assembly} & {\em Meaning} \\ \hline \hline
\jam?????000 & R & (halt) & halts the machine  \\ \hline
\jam????x100 & R & (print $x$) & prints the contents of $Rx$ \\ \hline
\jam?????200 & R & (newline) & prints a newline character \\ \hline
\end{tabular}
\end{quote}
