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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 1B - BIOS Ctrl-Break Handler Address</title>
<meta name="FORMATTER" content="Microsoft FrontPage 2.0">
</head>
<body>
<h1><a name="kap_interrupt_1370"></a>INT 1B - BIOS Ctrl-Break
Handler Address</h1>
<p> - holds address of the BIOS Ctrl-Break interrupt handler</p>
<p> - called by ~INT 9~ after Ctrl-Break key is pressed; INT 9
sets the</p>
<p> BIOS keyboard head and tail pointers to the buffer start and</p>
<p> places a zero word in the buffer</p>
<p> - the BIOS initially sets this value to point to a simple
~IRET~ but</p>
<p> DOS re-vectors this to its own code, usually 2 lines of code
that</p>
<p> sets an internal flag (to 3) and then returns via IRET.</p>
<p> - DOS checks this flag on entry to many of its subfunctions.
If the</p>
<p> flag is set, it invokes ~INT 23~.</p>
<p> - pointing this address to a null function with and IRET
disables</p>
<p> Ctrl-Break aborts</p>
<p> - if the INT 1B code chooses to retain control of the system,
it</p>
<p> must issue an EOI for any interrupt pending on the ~8259~ and
reset</p>
<p> all I/O devices</p>
<p> - should be terminated via an IRET</p>
<p> - should not be called directly by user application</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>