136 lines
2.6 KiB
HTML
136 lines
2.6 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 10,12 - Video Subsystem Configuration (EGA/VGA)</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_0260"></a>INT 10,12 - Video Subsystem
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Configuration (EGA/VGA)</h1>
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<p> AH = 12h</p>
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<p> % BL = 10 return video configuration information</p>
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<p> on return:</p>
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<p> BH = 0 if color mode in effect</p>
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<p> = 1 if mono mode in effect</p>
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<p> BL = 0 if 64k EGA memory</p>
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<p> = 1 if 128k EGA memory</p>
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<p> = 2 if 192k EGA memory</p>
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<p> = 3 if 256k EGA memory</p>
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<p> CH = feature bits</p>
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<p> CL = switch settings</p>
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<p> % BL = 20 select alternate print screen routine</p>
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<p> % BL = 30 select scan lines for alphanumeric modes</p>
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<p> AL = 0 200 scan lines</p>
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<p> = 1 350 scan lines</p>
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<p> = 2 400 scan lines</p>
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<p> on return:</p>
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<p> AL = 12</p>
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<p> % BL = 31 select default palette loading</p>
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<p> AL = 0 enable default palette loading</p>
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<p> = 1 disable default palette loading</p>
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<p> on return:</p>
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<p> AL = 12</p>
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<p> % BL = 32 CPU access to video RAM</p>
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<p> AL = 0 enable CPU access to video RAM and I/O ports</p>
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<p> = 1 disable CPU access to video RAM and I/O ports</p>
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<p> on return:</p>
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<p> AL = 12</p>
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<p> % BL = 33 Gray scale summing</p>
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<p> AL = 0 enable gray scale summing</p>
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<p> = 2 disable gray scale summing</p>
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<p> on return:</p>
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<p> AL = 12</p>
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<p> % BL = 34 cursor emulation</p>
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<p> AL = 0 enable cursor emulation</p>
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<p> = 1 disable cursor emulation</p>
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<p> on return:</p>
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<p> AL = 12</p>
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<p> % BL = 35 PS/2 video display switching</p>
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<p> AL = 0 initial adapter video off</p>
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<p> = 1 initial planar video on</p>
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<p> = 2 switch active video off</p>
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<p> = 3 switch inactive video on</p>
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<p> ES:DX pointer to 128 byte save area (when AL = 0, 2 or 3)</p>
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<p> on return:</p>
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<p> AL = 12</p>
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<p> % BL = 36 video refresh control</p>
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<p> AL = 0 enable refresh</p>
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<p> = 1 disable refresh</p>
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<p> on return:</p>
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<p> AL = 12</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%">Zur<EFBFBD>ck 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.<2E>nderung <!--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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