106 lines
2.5 KiB
HTML
106 lines
2.5 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
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<html>
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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 1E - Disk Initialization Parameter Table Vector</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_1400"></a>INT 1E - Disk Initialization
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Parameter Table Vector</h1>
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<p> - not an interrupt, but a far pointer to the diskette base
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table</p>
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<p> - this table contains initialization parameters for the disk</p>
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<p> controller used during formatting, reading, and writing to a
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disk</p>
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<p> % Disk Initialization Parameter Table Vector Definition:</p>
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<p> % Offset Description</p>
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<p> 00 ¦7¦6¦5¦4¦3¦2¦1¦0¦ Disk Controller Mode byte 1</p>
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<p> ¦ ¦ ¦ ¦ +---------- head step rate in milliseconds (0-F)</p>
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<p> +----------------- head unload time in milliseconds (0-F)</p>
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<p> 01 ¦7¦6¦5¦4¦3¦2¦1¦0¦ Disk Controller Mode byte 2</p>
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<p> ¦ ¦ ¦ ¦ ¦ ¦ ¦ +---- DMA flag (0 = use DMA)</p>
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<p> +----------------- (head load time/2)-1 in milliseconds</p>
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<p> 02 clock ticks until motor off</p>
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<p> 03 FM or MFM Mode: Log2 (Bytes per Sector/128)</p>
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<p> FM=Frequency Modulation used on single-density disks</p>
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<p> MFM=Modified Frequency Modulation used on double-sided disks</p>
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<p> 04 last sector on track</p>
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<p> 05 gap length in bytes:</p>
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<p> Bytes Per Sectors Write Format</p>
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<p> MFM Sector Per Track Gap Gap</p>
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<p> 1 256 18 0Ah 0Ch</p>
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<p> 1 256 16 20h 32h</p>
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<p> 2 512 8 2Ah 50h</p>
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<p> 2 512 9 1Bh 6Ch</p>
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<p> 3 1024 4 80h F0h</p>
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<p> 4 2048 2 C8h FFh</p>
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<p> 5 4096 1 C8h FFh</p>
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<p> 06 disk data length</p>
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<p> 80h for 128 bytes/sector</p>
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<p> FFh otherwise</p>
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<p> 07 gap length when formatting</p>
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<p> 08 data pattern used during formatting</p>
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<p> 09 floppy head bounce delay (in milliseconds)</p>
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<p> 0A floppy motor start delay (in 0.125 second intervals)</p>
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<p> 0B floppy motor stop delay (in 0.25 second intervals)</p>
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<p> - see ~INT 13,18~</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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