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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<meta http-equiv="Content-Type"
content="text-html; charset=Windows-1252">
<title>INT 33,18 - Set alternate subroutine call mask and address</title>
<meta name="FORMATTER" content="Microsoft FrontPage 2.0">
</head>
<body>
<h1><a name="kap_interrupt_3390"></a>INT 33,18 - Set alternate
subroutine call mask and address</h1>
<p> AX = 18h</p>
<p> DX = offset to function</p>
<p> CX = user interrupt mask:</p>
<p> <20>F-8<>7<EFBFBD>6<EFBFBD>5<EFBFBD>4<EFBFBD>3<EFBFBD>2<EFBFBD>1<EFBFBD>0<EFBFBD> user interrupt mask in CX</p>
<p> <20> <20> <20> <20> <20> <20> <20> <20> +--- alt key pressed during event</p>
<p> <20> <20> <20> <20> <20> <20> <20> +---- ctrl key pressed during event</p>
<p> <20> <20> <20> <20> <20> <20> +----- shift key pressed during event</p>
<p> <20> <20> <20> <20> <20> +------ right button up event</p>
<p> <20> <20> <20> <20> +------- right button down event</p>
<p> <20> <20> <20> +-------- left button up event</p>
<p> <20> <20> +--------- left button down event</p>
<p> <20> +---------- cursor moved</p>
<p> +------------ unused</p>
<p> - entire mask is set to zero when ~INT 33,0~ is called</p>
<p> - up to three handlers may be defined with this call</p>
<p> - mask should be cleared before program exit</p>
<p> - when handler is called it receives parameters in the
following</p>
<p> registers:</p>
<p> AX = condition mask causing call</p>
<p> CX = horizontal cursor position</p>
<p> DX = vertical cursor position</p>
<p> DI = horizontal counts</p>
<p> SI = vertical counts</p>
<p> DS = mouse driver data segment</p>
<p> BX = button state:</p>
<p> <20>F-2<>1<EFBFBD>0<EFBFBD></p>
<p> <20> <20> +--- left button (1 = pressed)</p>
<p> <20> +---- right button (1 = pressed)</p>
<p> +------ unused</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>