79 lines
1.9 KiB
HTML
79 lines
1.9 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 21,30 - Get DOS Version Number</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_1900"></a>INT 21,30 - Get DOS Version
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Number</h1>
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<p> AH = 30h</p>
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<p> on return:</p>
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<p> AL = major version number (2-5)</p>
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<p> AH = minor version number (in hundredths decimal)</p>
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<p> BH = FF indicates MS-DOS, only if OEM vendor chooses to
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identify</p>
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<p> = 00 indicates PC-DOS</p>
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<p> BL:CX = 24 bit OEM serial number if BH is FF</p>
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<p> - for an example DOS version 2.1 returns AL=2 and AH=10</p>
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<p> - DOS versions prior to DOS 2.0 return zero in AH and AL</p>
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<p> - DOS version 4.0 and 4.1 usually return the same value of
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4.00</p>
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<p> - the OEM serial number is a rarity, though some older OEM
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DOS</p>
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<p> versions implemented this feature</p>
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<p> - the OS/2 compatibility box returns 10.10 for OS/2 1.1,
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10.20</p>
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<p> for OS/2 1.2, etc...</p>
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<p> - when testing for version, a specific test can often cause
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your</p>
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<p> code to not work in following versions of DOS. It is often
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better</p>
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<p> to test for a version number greater or equal to the minimum
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rather</p>
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<p> than a specific version number where possible</p>
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<p> - see ~DOS Versions~</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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