---
myst:
  html_meta:
    keywords: LaTeX, messages d'erreurs, format DVI, polices, Metafont"
---
# Where are the `am` fonts ?

One *still* occasionally comes across a request for the `am` series of fonts. The initials stood for "Almost \[Computer\] Modern", and they were the predecessors of the Computer Modern fonts that we all know and love (or hate)<sup class="fmk">†</sup>. There's not a lot one can do with these fonts; they are (as their name implies) almost (but not quite) the same as the `cm` series; if you're faced with a document that requests them, the only reasonable approach is to edit the document to replace `am**` font names with `cm**`.

> <sup class="fmk">†</sup>
> The fonts acquired their label "Almost following the realisation
> that their first implementation in MetaFont79 still wasn't quite right;
> Knuth's original intention had been that they were the final answer.

The appearance of DVI files that request them is sufficiently rare that no-one has undertaken the mammoth task of creating a translation of them by means of virtual fonts.

You therefore have to fool the system into using `cm*` fonts where the original author specified `am*`.

One option is the font substitutions that many DVI drivers provide via their configuration file --- specify that every `am` font should be replaced by its corresponding `cm` font.

Alternatively, one may try DVI editing --- packages <ctanpkg:dtl> (DVI Text Language) and <ctanpkg:dviasm> (DVI assembler) can both provide round trips from DVI to text and back to DVI. One therefore edits font names (throughout the text representation of the file) in the middle of that round trip.

The DTL text is pretty straightforward, for this purpose : fontnames are in single quotes at the end of lines, so :

```
dv2dt -o ⟨doc.txt⟩ ⟨doc.dvi⟩
```

```
(*edit the txt file*)
```

```
dt2dv -o ⟨edited.dvi⟩ ⟨edited.txt⟩
```

(you have to compile the C programs for this).

`Dviasm` is a `Python` script; its output has font names in a section near the start of the document, and then dotted about through the body, so :

```
python dviasm.py -o ⟨doc.txt⟩ ⟨doc.dvi⟩
```

```
(*edit the txt file*)
```

```
python dviasm.py -o ⟨edited.dvi⟩ ⟨edited.txt⟩
```

Both routes seem acceptable ways forward; it is a matter of taste which any particular user may choose (it's not likely that it will be necessary very often...).

:::{sources}
[Where are the am fonts?](faquk:FAQ-amfonts)
:::