When using compatibility mode, it is possible that you will find
problems with font-changing commands in some old documents. These
problems are of two types:
- producing error messages;
- not producing the font changes you expected.
In case of error messages it is possible that the document (or an old
style file used therein) contains references to old internal commands
which are no longer defined, see Section~#Secoldinternals#537> for
more information if this is the case.
One example of the unexpected is if you use one of the new style of
math-mode font changing command as follows:
verbatim24
You may well find that this behaves as if you had put:
verbatim25
everything including the A coming out bold.
LaTeX~2.09 allowed sites to customize their LaTeX<#539#><#539#> installation,
which resulted in documents producing different results on different
LaTeX<#540#><#540#> installations. LaTeX2e<#541#><#541#> no longer allows so much
customization but, for compatibility with old documents, the local
configuration file 368 is loaded every time LaTeX2e<#542#><#542#>
enters LaTeX~2.09 compatibility mode.
For example, if your site was customized to use the New Font
Selection Scheme (NFSS) with the 369 option, then you can
make LaTeX2e<#543#><#543#> emulate this by creating a 370 file
containing the commands:
verbatim26
Similarly, to emulate NFSS<#544#><#544#> with the 371 option, you can
create a 372 file containing:
verbatim27