--- /dev/null
+<!DOCTYPE html
+ PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+ <head>
+ <meta http-equiv="content-type" content="text/html; charset=UTF-8" />
+ <title>TTXT – MODE 7 for the 21st century</title>
+ </head>
+ <body>
+ <h1>TTXT – MODE 7 for the 21st century</h1>
+ <p>TTXT is an outline font based on the characters produced by the
+ Mullard SAA5050 series of Teletext Character Generators. The
+ SAA5050 is familiar to those of a certain age as the one that
+ produced the <code>MODE 7</code> display on the BBC
+ Microcomputer. It generates characters from a 5 × 9 pixel
+ matrix, smoothing diagonal lines to produce an interlaced 10 ×
+ 18 matrix for each character. This font it generated by an
+ extension of the SAA5050’s smoothing algorithm. In addition to
+ the characters available from the SAA5050 itself, the font
+ includes characters from the other chips in the family
+ (including Cyrillic and Hebrew alphabets), an Arabic alphabet
+ found in an EBU document, and various other useful glyphs. All
+ glyphs are drawn on the same 5 × 9 pixel grid, albeit with a
+ slight variation to let the Arabic characters join up.</p>
+
+ <p>The outline version of the font is generated by an ANSI C program
+ which emits a Spline Font Database file for use with
+ <a href="http://fontforge.sourceforge.net/">Fontforge</a>, which
+ can convert it into most reasonable font formats.</p>
+
+ <ul>
+ <li><code><a href="ttxt.c"><code>ttxt.c</code></a> – The C
+ program that generates the font.</li>
+ <li><code><a href="ttxt.sfd"><code>ttxt.sfd</code></a> –
+ The Spline Font Database file for use with Fontforge.</li>
+ <li><code><a href="TTXT.otf"><code>TTXT.otf</code></a> –
+ The finished font in OpenType format.</li>
+ </ul>
+ </body>
+</html>
~bjharris / bedstead.git / commitdiff