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In the very earliest days of LaTeX2e, the only way to use the
T1 encoding was t1enc
; with the summer 1994
“production” release, the fontenc
package appeared, and
provided comprehensive support for use of the encoding.
Nevertheless, the t1enc
package remains (as part of the
LaTeX 2.09 compatibility code), but it does very little: it merely
selects font encoding T1, and leaves to the user the business
of generating the character codes required.
Generating such character codes could be a simple matter, if
the T1 encoding matched any widely-supported encoding standard,
since in that case, one might expect one’s keyboard to generate the
character codes. However, the T1 encoding is a mix of several
standard encodings, and includes code points in areas of the table
which standard encodings specifically exclude, so no T1
keyboards have been (or ever will be) manufactured.
By contrast, the fontenc
package generates the T1
code points from ordinary LaTeX commands (e.g., it generates the
character codepoint from the command
So, unless you have program-generated T1 input (which is almost
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URL for this question: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=t1enc
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This is FAQ version 3.27, released on 2013-06-07.