65 lines
1.6 KiB
HTML
65 lines
1.6 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
|
|
|
|
<html>
|
|
|
|
<head>
|
|
<meta http-equiv="Content-Type"
|
|
content="text-html; charset=Windows-1252">
|
|
<title>INT 15,4F - Keyboard Intercept (BIOS date specific)</title>
|
|
<meta name="FORMATTER" content="Microsoft FrontPage 2.0">
|
|
</head>
|
|
|
|
<body>
|
|
|
|
<h1><a name="kap_interrupt_0890"></a>INT 15,4F - Keyboard
|
|
Intercept (BIOS date specific)</h1>
|
|
|
|
<p> AH = 4F</p>
|
|
|
|
<p> AL = scan code</p>
|
|
|
|
<p> CF = set to 1 (via STC instruction)</p>
|
|
|
|
<p> on return</p>
|
|
|
|
<p> AH = 80h, CF set (PC, PCjr)</p>
|
|
|
|
<p> = 86h, CF set (XT BIOS 11/8/82, AT BIOS 1/10/84)</p>
|
|
|
|
<p> AL = CF set, new scan code</p>
|
|
|
|
<p> = CF clear, original scancode</p>
|
|
|
|
<p> - available with XT BIOS after 11/8/82, AT BIOS after 1/10/84</p>
|
|
|
|
<p> - called by ~INT 9~, makes allowance for keyboard translation</p>
|
|
|
|
<p> - normally returns the scan code in AL, with CF set</p>
|
|
|
|
<p> - if function returns with CF clear, INT 9 ignores keystroke</p>
|
|
|
|
<p> - do not rely on this function being called for each INT 9
|
|
since</p>
|
|
|
|
<p> any user INT 9 handler can exit prematurely and circumvent</p>
|
|
|
|
<p> this function</p>
|
|
|
|
<hr>
|
|
|
|
<table border="0" width="100%" cols="3">
|
|
<tr>
|
|
<td width="33%">Zurück 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.Änderung <!--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>
|