52 lines
1.3 KiB
HTML
52 lines
1.3 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 15,20 - PRINT.</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_0820"></a>INT 15,20 - PRINT.COM
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Critical Region Flag (undocumented DOS 3.x+)</h1>
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<p> AH = 20h</p>
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<p> AL = 00 disable user critical region flag</p>
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<p> = 01 enable user critical region flag</p>
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<p> ES:BX = pointer to user critical region flag byte (AH = 1)</p>
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<p> returns nothing</p>
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<p> - provides PRINT.COM with the address of a byte to increment
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on</p>
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<p> entry to DOS functions</p>
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<p> - see ~bibliography~ reference for "Undocumented
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DOS"</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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