\nopagenumbers
\newcount\n
\def\usefont#1 {\advance\n by 1 \expandafter\uf\csname\number\n\endcsname{#1}}
\def\uf#1#2{\font#1=#2 #1 A\par}

% the following fonts are currently preloaded in PLAIN.TEX[tex,sys]:

\usefont amr10 % normal text
\usefont amr9
\usefont amr8
\usefont amr7
\usefont amr6
\usefont amr5
\usefont ammi10 % math italic
\usefont ammi9
\usefont ammi8
\usefont ammi7
\usefont ammi6
\usefont ammi5
\usefont amsy10 % math symbols
\usefont amsy9
\usefont amsy8
\usefont amsy7
\usefont amsy6
\usefont amsy5
\usefont amex10 % math extension
\usefont amss10 % sans serif
\usefont amssq8
\usefont amssi10 % sans serif italic
\usefont amssqi8
\usefont ambx10 % boldface extended
\usefont ambx9
\usefont ambx8
\usefont ambx7
\usefont ambx6
\usefont ambx5
\usefont amtt10 % typewriter
\usefont amtt9
\usefont amtt8
\usefont amsltt10 % slanted typewriter
\usefont amsl10 % slanted roman
\usefont amsl9
\usefont amsl8
\usefont amti10 % text italic
\usefont amti9
\usefont amti8
\usefont amti7
\usefont amu10 % unslanted text italic
\usefont ambi10 % bold math italic
\usefont ambsy10 % bold math symbols
\usefont amcsc10 % caps and small caps
\usefont amssbx10 % sans serif bold extended
\usefont amdunh10 % Dunhill style
\usefont {amr7 scaled \magstep4} % for titles
\usefont {amtt10 scaled \magstep2}
\usefont {amssbx10 scaled \magstep2}
\usefont manfnt % METAFONT logo and dragon curve and special symbols

\bye