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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 15,C0 - Return System Configuration Parameters (PS/2
only)</title>
<meta name="FORMATTER" content="Microsoft FrontPage 2.0">
</head>
<body>
<h1><a name="kap_interrupt_1020"></a>INT 15,C0 - Return System
Configuration Parameters (PS/2 only)</h1>
<p> AH = C0</p>
<p> on return:</p>
<p> CF = 0 if successful</p>
<p> = 1 if error</p>
<p> AH = when CF set, 80h for PC &amp; PCjr, 86h for XT</p>
<p> (BIOS after 11/8/82) and AT (BIOS after 1/10/84)</p>
<p> ES:BX = pointer to system descriptor table in ROM of the
format:</p>
<p> % Offset Size Description</p>
<p> 00 word length of descriptor (8 minimum)</p>
<p> 02 byte model byte (same as F000:FFFE, not reliable)</p>
<p> 03 byte secondary model byte</p>
<p> 04 byte BIOS revision level (zero based)</p>
<p> 05 byte feature information, see below</p>
<p> 06 dword reserved</p>
<p> % Feature Information</p>
<p> <20>7<EFBFBD>6<EFBFBD>5<EFBFBD>4<EFBFBD>3<EFBFBD>2<EFBFBD>1<EFBFBD>0<EFBFBD> Feature Byte</p>
<p> <20> <20> <20> <20> <20> <20> <20> +---- reserved</p>
<p> <20> <20> <20> <20> <20> <20> +----- 0=PC bus, 1=Micro Channel</p>
<p> <20> <20> <20> <20> <20> +------ Extended BIOS Data Area
(~EBDA~)allocated</p>
<p> <20> <20> <20> <20> +------- wait for external event supported</p>
<p> <20> <20> <20> +-------- ~INT 15,4F~ used (kbd intercept)</p>
<p> <20> <20> +--------- ~RTC~ present</p>
<p> <20> +---------- 2nd ~8259~ present</p>
<p> +----------- DMA channel 3 used by fixed disk BIOS</p>
<p> - see ~MACHINE ID~</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>