mirror of
https://bjh21.me.uk/bedstead/.git
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41 lines
2.0 KiB
HTML
41 lines
2.0 KiB
HTML
<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
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<title>Bedstead – MODE 7 for the 21st century</title>
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</head>
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<body>
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<h1>Bedstead – MODE 7 for the 21st century</h1>
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<p>Bedstead is an outline font based on the characters produced by the
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Mullard SAA5050 series of Teletext Character Generators. The
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SAA5050 is familiar to those of a certain age as the one that
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produced the <code>MODE 7</code> display on the BBC
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Microcomputer. It generates characters from a 5 × 9 pixel
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matrix, smoothing diagonal lines to produce an interlaced 10 ×
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18 matrix for each character. This font it generated by an
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extension of the SAA5050’s smoothing algorithm. In addition to
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the characters available from the SAA5050 itself, the font
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includes characters from the other chips in the family
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(including Cyrillic and Hebrew alphabets), an Arabic alphabet
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found in an EBU document, and various other useful glyphs. All
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glyphs are drawn on the same 5 × 9 pixel grid, albeit with a
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slight variation to let the Arabic characters join up.</p>
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<p>The outline version of the font is generated by an ANSI C program
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which emits a Spline Font Database file for use with
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<a href="http://fontforge.sourceforge.net/">Fontforge</a>, which
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can convert it into most reasonable font formats.</p>
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<ul>
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<li><code><a href="ttxt.c"><code>ttxt.c</code></a> – The C
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program that generates the font.</li>
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<li><code><a href="ttxt.sfd"><code>ttxt.sfd</code></a> –
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The Spline Font Database file for use with Fontforge.</li>
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<li><code><a href="Bedstead.otf"><code>Bedstead.otf</code></a> –
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The finished font in OpenType format.</li>
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</ul>
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</body>
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</html>
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