Use mlmodern fonts with Plain TeX or OpTeX

fontsoptexplain-tex

I would like to systematically use mlmodern fonts with Plain TeX and even OpTeX, but I am unable to convert the code of mlmodern.sty into a code which could be understood by the tex or optex compilers. Is this possible?

Best Answer

For plain TeX you have to essentially repeat all the “fonts” part in plain.tex.

\font\tenrm=rm-mlmr10 % roman text
\font\preloaded=rm-mlmr9
\font\preloaded=rm-mlmr8
\font\sevenrm=rm-mlmr7
\font\preloaded=rm-mlmr6
\font\fiverm=rm-mlmr5
\font\teni=mlmmi10 % math italic
\font\preloaded=mlmmi9
\font\preloaded=mlmmi8
\font\seveni=mlmmi7
\font\preloaded=mlmmi6
\font\fivei=mlmmi5
\font\tensy=mlmsy10 % math symbols
\font\preloaded=mlmsy9
\font\preloaded=mlmsy8
\font\sevensy=mlmsy7
\font\preloaded=mlmsy6
\font\fivesy=mlmsy5
\font\tenex=mlmex10 % math extension
\font\preloaded=rm-mlmss10 % sans serif
%\font\preloaded=rm-mlmssq8
\font\preloaded=rm-mlmsso10 % sans serif italic
%\font\preloaded=rm-mlmssqi8
\font\tenbf=rm-mlmbx10 % boldface extended
\font\preloaded=rm-mlmbx9
\font\preloaded=rm-mlmbx8
\font\sevenbf=rm-mlmbx7
\font\preloaded=rm-mlmbx6
\font\fivebf=rm-mlmbx5
\font\tentt=rm-mlmtt10 % typewriter
\font\preloaded=rm-mlmtt9
\font\preloaded=rm-mlmtt8
\font\preloaded=rm-mlmtto10 % slanted typewriter
\font\tensl=rm-mlmro10 % slanted roman
\font\preloaded=rm-mlmro9
\font\preloaded=rm-mlmro8
\font\tenit=rm-mlmri10 % text italic
\font\preloaded=rm-mlmri9
\font\preloaded=rm-mlmri8
\font\preloaded=rm-mlmri7
\font\preloaded=rm-mlmu10 % unslanted text italic
\font\preloaded=mlmmib10 % bold math italic
\font\preloaded=mlmbsy10 % bold math symbols
\font\preloaded=rm-mlmcsc10 % caps and small caps
%\font\preloaded=rm-mlmssbx10 % sans serif bold extended
%\font\preloaded=rm-mlmdunh10 % Dunhill style
\font\preloaded=rm-mlmr7 scaled \magstep4 % for titles
\font\preloaded=rm-mlmtt10 scaled \magstep2
\font\preloaded=rm-mlmssbx10 scaled \magstep2

\let\preloaded=\undefined % preloaded fonts must be declared anew later.

\skewchar\teni='177 \skewchar\seveni='177 \skewchar\fivei='177
\skewchar\tensy='60 \skewchar\sevensy='60 \skewchar\fivesy='60

\textfont0=\tenrm \scriptfont0=\sevenrm \scriptscriptfont0=\fiverm
\def\rm{\fam\z@\tenrm}
\textfont1=\teni \scriptfont1=\seveni \scriptscriptfont1=\fivei
\def\mit{\fam\@ne} \def\oldstyle{\fam\@ne\teni}
\textfont2=\tensy \scriptfont2=\sevensy \scriptscriptfont2=\fivesy
\def\cal{\fam\tw@}
\textfont3=\tenex \scriptfont3=\tenex \scriptscriptfont3=\tenex
\newfam\itfam \def\it{\fam\itfam\tenit} % \it is family 4
\textfont\itfam=\tenit
\newfam\slfam \def\sl{\fam\slfam\tensl} % \sl is family 5
\textfont\slfam=\tensl
\newfam\bffam \def\bf{\fam\bffam\tenbf} % \bf is family 6
\textfont\bffam=\tenbf \scriptfont\bffam=\sevenbf
\scriptscriptfont\bffam=\fivebf
\newfam\ttfam \def\tt{\fam\ttfam\tentt} % \tt is family 7
\textfont\ttfam=\tentt

\tenrm

Abc {\it def\/} {\sl ghi\/} {\bf jkl}

$a+b+\alpha$

$$
\sum+\int_\Gamma
$$

\bye

I found the names by looking in the .fd files.

enter image description here

Running pdffonts on the PDF file shows

name                                 type              encoding         emb sub uni object ID
------------------------------------ ----------------- ---------------- --- --- --- ---------
VAJVJL+MLMRoman10-Regular            Type 1            Custom           yes yes no       4  0
XAMRRZ+MLMRoman10-Italic             Type 1            Custom           yes yes no       5  0
QLCGIE+MLMRomanSlant10-Regular       Type 1            Custom           yes yes no       6  0
BUCLYS+MLMRoman10-Bold               Type 1            Custom           yes yes no       7  0
HJQQGN+MLMMathItalic10-Regular       Type 1            Custom           yes yes no       8  0
LGTMNF+MLMMathExtension10-Regular    Type 1            Custom           yes yes no       9  0
CMLUYB+MLMRoman7-Regular             Type 1            Custom           yes yes no      10  0
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