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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<meta http-equiv="Content-Type"
content="text-html; charset=Windows-1252">
<title>INT 13,2 - Read Disk Sectors</title>
<meta name="FORMATTER" content="Microsoft FrontPage 2.0">
</head>
<body>
<h1><a name="kap_interrupt_0430"></a>INT 13,2 - Read Disk Sectors</h1>
<p> AH = 02</p>
<p> AL = number of sectors to read (1-128 dec.)</p>
<p> CH = track/cylinder number (0-1023 dec., see below)</p>
<p> CL = sector number (1-17 dec.)</p>
<p> DH = head number (0-15 dec.)</p>
<p> DL = drive number (0=A:, 1=2nd floppy, 80h=drive 0, 81h=drive
1)</p>
<p> ES:BX = pointer to buffer</p>
<p> on return:</p>
<p> AH = status (see ~INT 13,STATUS~)</p>
<p> AL = number of sectors read</p>
<p> CF = 0 if successful</p>
<p> = 1 if error</p>
<p> - BIOS disk reads should be retried at least three times and
the</p>
<p> controller should be reset upon error detection</p>
<p> - be sure ES:BX does not cross a 64K segment boundary or a</p>
<p> DMA boundary error will occur</p>
<p> - many programming references list only floppy disk register
values</p>
<p> - only the disk number is checked for validity</p>
<p> - the parameters in CX change depending on the number of
cylinders;</p>
<p> the track/cylinder number is a 10 bit value taken from the 2
high</p>
<p> order bits of CL and the 8 bits in CH (low order 8 bits of
track):</p>
<p> <20>F<EFBFBD>E<EFBFBD>D<EFBFBD>C<EFBFBD>B<EFBFBD>A<EFBFBD>9<EFBFBD>8<EFBFBD>7<EFBFBD>6<EFBFBD>5-0<> CX</p>
<p> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> +----- sector number</p>
<p> <20> <20> <20> <20> <20> <20> <20> <20> +--------- high order 2 bits of
track/cylinder</p>
<p> +------------------------ low order 8 bits of track/cyl
number</p>
<p> - see ~INT 13,A~</p>
<hr>
<table border="0" width="100%" cols="3">
<tr>
<td width="33%">Zur<EFBFBD>ck zum <a href="inte1at0.htm">Interrupt
Info</a>. </td>
<td align="center" width="33%"><a
href="mailto:Roger.Morgan@htl-steyr.ac.at">Roger Morgan</a>
/ 1998 </td>
<td align="right" width="33%"><font size="1">L.<2E>nderung <!--webbot
bot="Timestamp" s-type="EDITED" s-format="%d.%m.%y"
startspan -->29.03.99<!--webbot bot="Timestamp" endspan
i-checksum="13964" --> </font></td>
</tr>
</table>
</body>
</html>