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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 1A,4 - Read Real Time Clock Date (XT 286,AT,PS/2)</title>
<meta name="FORMATTER" content="Microsoft FrontPage 2.0">
</head>
<body>
<h1><a name="kap_interrupt_1280"></a>INT 1A,4 - Read Real Time
Clock Date (XT 286,AT,PS/2)</h1>
<p> AH = 04</p>
<p> on return:</p>
<p> CH = century in BCD (decimal 19 or 20)</p>
<p> CL = year in BCD</p>
<p> DH = month in BCD</p>
<p> DL = day in BCD</p>
<p> CF = 0 if successful</p>
<p> = 1 if error or clock not operating</p>
<p> - calling this interrupt will update the DOS maintained date
and</p>
<p> reset the ~BIOS Data Area~ date rollover flag at 40:70</p>
<p> - see ~RTC~</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>