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+<html>
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+<head>
+<meta http-equiv="Content-Type"
+content="text-html; charset=Windows-1252">
+<title>INT 21,6C - Extended Open/Create (DOS 4.</title>
+<meta name="FORMATTER" content="Microsoft FrontPage 2.0">
+</head>
+
+<body>
+
+<h1><a name="kap_interrupt_2790"></a>INT 21,6C - Extended
+Open/Create (DOS 4.x+)</h1>
+
+<p> AH = 6C</p>
+
+<p> AL = 00</p>
+
+<p> BX = open mode (see below)</p>
+
+<p> CX = file attribute (see ~FILE ATTRIBUTES~, bits 15-8 are
+zero)</p>
+
+<p> DX = function control indicator (see below)</p>
+
+<p> DS:SI = ASCIIZ filespec</p>
+
+<p> returns:</p>
+
+<p> AX = handle if CF clear</p>
+
+<p> = error code if CF set (see ~DOS ERROR CODES~)</p>
+
+<p> CX = 01 file opened</p>
+
+<p> = 02 file created and opened</p>
+
+<p> = 03 file truncated and opened (replaced)</p>
+
+<p> CF = 0 if successful</p>
+
+<p> = 1 if error</p>
+
+<p> % Open Mode in BX:</p>
+
+<p> <20>F<EFBFBD>E<EFBFBD>D<EFBFBD>C<EFBFBD>B<EFBFBD>A<EFBFBD>9<EFBFBD>8<EFBFBD>7<EFBFBD>6<EFBFBD>5<EFBFBD>4<EFBFBD>3<EFBFBD>2<EFBFBD>1<EFBFBD>0<EFBFBD> BX (Open
+Mode)</p>
+
+<p> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> +-------- read/write
+access mode</p>
+
+<p> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> +-------- reserve (must
+be 0)</p>
+
+<p> <20> <20> <20> <20> <20> <20> <20> <20> <20> +------------ sharing mode</p>
+
+<p> <20> <20> <20> <20> <20> <20> <20> <20> +------------ 1 = private, 0 =
+inheritable</p>
+
+<p> <20> <20> <20> +-------------------- reserved</p>
+
+<p> <20> <20> +-------------------- 0 = call INT 24, 1 = ignore INT
+24</p>
+
+<p> <20> +-------------------- 0 = normal write, 1 = flush each
+write</p>
+
+<p> +-------------------- reserved</p>
+
+<p> % Read/Write Access bits: Sharing Mode bits:</p>
+
+<p> % 210 654</p>
+
+<p> 000 read access 000 compatibility mode</p>
+
+<p> 001 write access 001 read/write access</p>
+
+<p> 010 read/write access 010 write access denied</p>
+
+<p> 011 read access denied</p>
+
+<p> 100 full access</p>
+
+<p> % Function Control Indicator in DX:</p>
+
+<p> <20>F<EFBFBD>E<EFBFBD>D<EFBFBD>C<EFBFBD>B<EFBFBD>A<EFBFBD>9<EFBFBD>8<EFBFBD>7<EFBFBD>6<EFBFBD>5<EFBFBD>4<EFBFBD>3<EFBFBD>2<EFBFBD>1<EFBFBD>0<EFBFBD> DX
+(Function Control)</p>
+
+<p> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> +---------- file
+existence behavior</p>
+
+<p> <20> <20> <20> <20> <20> <20> <20> <20> +----------------- creation behavior</p>
+
+<p> +-------------------------------- reserved</p>
+
+<p> % File Existence Behavior bits:</p>
+
+<p> % 3210</p>
+
+<p> 0000 if file exist, generate error, take no action</p>
+
+<p> 0001 if file exists, open file</p>
+
+<p> 0010 if file exists, truncate and open</p>
+
+<p> % Creation Behavior bits:</p>
+
+<p> % 7654</p>
+
+<p> 0000 if file does not exist, generate error, take no action</p>
+
+<p> 0001 if file does not exist, create</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>