Viitor_cc65/usr/share/doc/cc65/webdoc/atari-7.html
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<TITLE>Atari specific information for cc65: DIO implementation</TITLE>
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<H2><A NAME="dio"></A> <A NAME="s7">7.</A> <A HREF="atari.html#toc7">DIO implementation</A></H2>
<P>The Atari supports disk drives with either 128 or 256 byte sectors.
The first three sectors of any disk are always 128 bytes long though. This is
because the system can only boot from 128 bytes sectors.</P>
<P>Therefore the DIO read and write functions transfer only 128 bytes
for sectors 1 to 3, regardless of the type of diskette.</P>
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