98 lines
2.4 KiB
HTML
98 lines
2.4 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type"
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content="text-html; charset=Windows-1252">
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<title>INT 11 - BIOS Equipment Determination / BIOS Equipment
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Flags</title>
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<meta name="FORMATTER" content="Microsoft FrontPage 2.0">
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</head>
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<body>
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<h1><a name="kap_interrupt_0370"></a>INT 11 - BIOS Equipment
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Determination / BIOS Equipment Flags</h1>
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<p> no input data</p>
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<p> on return:</p>
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<p> AX contains the following bit flags:</p>
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<p> ¦F¦E¦D¦C¦B¦A¦9¦8¦7¦6¦5¦4¦3¦2¦1¦0¦ AX</p>
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<p> ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +---- IPL
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diskette installed</p>
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<p> ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +----- math
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coprocessor</p>
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<p> ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +-------- old PC system
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board RAM < 256K</p>
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<p> ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +----- pointing device
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installed (PS/2)</p>
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<p> ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +------ not used on PS/2</p>
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<p> ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +--------- initial video mode</p>
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<p> ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +------------ # of diskette drives,
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less 1</p>
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<p> ¦ ¦ ¦ ¦ ¦ ¦ ¦ +------------- 0 if DMA installed</p>
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<p> ¦ ¦ ¦ ¦ +------------------ number of serial ports</p>
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<p> ¦ ¦ ¦ +------------------- game adapter installed</p>
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<p> ¦ ¦ +-------------------- unused, internal modem (PS/2)</p>
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<p> +----------------------- number of printer ports</p>
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<p> - bits 3 & 2, system board RAM if less than 256K
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motherboard</p>
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<p> 00 - 16K 01 - 32K</p>
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<p> 10 - 16K 11 - 64K (normal)</p>
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<p> - bits 5 & 4, initial video mode</p>
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<p> 00 - unused 01 - 40x25 color</p>
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<p> 10 - 80x25 color 11 - 80x25 monochrome</p>
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<p> - bits 7 & 6, number of disk drives attached, when bit
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0=1</p>
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<p> 00 - 1 drive 01 - 2 drives</p>
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<p> 10 - 3 drive 11 - 4 drives</p>
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<p> - returns data stored at ~BIOS Data Area~ location 40:10</p>
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<p> - some flags are not guaranteed to be correct on all machines</p>
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<p> - bit 13 is used on the PCjr to indicate serial printer</p>
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<hr>
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<table border="0" width="100%" cols="3">
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<tr>
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<td width="33%">Zurück zum <a href="inte1at0.htm">Interrupt
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Info</a>. </td>
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<td align="center" width="33%"><a
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href="mailto:Roger.Morgan@htl-steyr.ac.at">Roger Morgan</a>
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/ 1998 </td>
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<td align="right" width="33%"><font size="1">L.Änderung <!--webbot
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bot="Timestamp" s-type="EDITED" s-format="%d.%m.%y"
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startspan -->29.03.99<!--webbot bot="Timestamp" endspan
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i-checksum="13964" --> </font></td>
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</tr>
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</table>
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</body>
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</html>
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