103 lines
2.4 KiB
HTML
103 lines
2.4 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type"
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content="text-html; charset=Windows-1252">
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<title>INT 13,A - Read Long Sector (XT & newer)</title>
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<meta name="FORMATTER" content="Microsoft FrontPage 2.0">
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</head>
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<body>
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<h1><a name="kap_interrupt_0500"></a>INT 13,A - Read Long Sector
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(XT & newer)</h1>
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<p> AH = 0A</p>
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<p> AL = number of sectors (1-121 dec.)</p>
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<p> CH = track number (0-1023 dec., see below)</p>
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<p> CL = sector number (1-17 dec., see below)</p>
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<p> DH = head number (0-15 dec.)</p>
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<p> DL = fixed drive number (80h=drive 0, 81h=drive 1)</p>
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<p> ES:BX = address of buffer</p>
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<p> on return:</p>
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<p> AH = status (see ~INT 13,STATUS~)</p>
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<p> AL = number of sectors actually transferred</p>
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<p> CF = 0 if successful</p>
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<p> = 1 if error</p>
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<p> - BIOS disk reads should be retried at least three times and
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the</p>
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<p> controller should be reset upon error detection</p>
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<p> - many good programming references indicate this function is
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only</p>
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<p> available on the AT, PS/2 and later systems, but all hard
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disk</p>
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<p> systems since the XT have this function available</p>
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<p> - reads regular data sectors (128-1024 bytes) with an
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additional</p>
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<p> 4 byte ECC code included</p>
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<p> - a DMA boundary error will occur if the buffer at ES:BX
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crosses</p>
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<p> a 64K segment boundary</p>
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<p> - only the disk number is checked for validity</p>
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<p> - the parameters in CX change depending on the number of
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cylinders;</p>
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<p> the track/cylinder number is a 10 bit value taken from the 2
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high</p>
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<p> order bits of CL and the 8 bits in CH (low order 8 bits of
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track):</p>
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<p> ¦F¦E¦D¦C¦B¦A¦9¦8¦7¦6¦5¦4¦3¦2¦1¦0¦ CX</p>
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<p> ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +-------------- sector number</p>
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<p> ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +-------------- high order 2 bits of
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track number</p>
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<p> +-------------------------- low order 8 bits of track number</p>
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<p> - see ~INT 13,2~</p>
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<hr>
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<table border="0" width="100%" cols="3">
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<tr>
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<td width="33%">Zurück zum <a href="inte1at0.htm">Interrupt
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Info</a>. </td>
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<td align="center" width="33%"><a
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href="mailto:Roger.Morgan@htl-steyr.ac.at">Roger Morgan</a>
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/ 1998 </td>
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<td align="right" width="33%"><font size="1">L.Änderung <!--webbot
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bot="Timestamp" s-type="EDITED" s-format="%d.%m.%y"
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startspan -->29.03.99<!--webbot bot="Timestamp" endspan
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i-checksum="13964" --> </font></td>
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</tr>
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</table>
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</body>
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</html>
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