\font\tenrm=amr10 % temporary substitutions during font development
\font\tentt=amtt
\font\tenbf=ambx10
\let\mainfont=\tenrm
\textfont0=\tenrm
\font\oldtenrm=cmr10
\textfont8=\oldtenrm
\mathchardef\Omega"780A
\mathchardef\Psi"7809
\mathchardef\Phi"7808
\mathchardef\Upsilon"7807
\mathchardef\Sigma"7806
\mathchardef\Pi"7805
\mathchardef\Xi"7804
\mathchardef\Lambda"7803
\mathchardef\Theta"7802
\mathchardef\Delta"7801
\mathchardef\Gamma"7800
\rm