lostecho/oldlinux-files
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

add directory study

Browse Source
This commit is contained in:
gohigh
2024-02-19 00:25:23 -05:00
parent b1306b38b1
commit f3774e2f8c
4001 changed files with 2285787 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

48
study/Ref-docs/manual Intel386/I386Manual/AAD.HTM Normal file
View File

@@ -0,0 +1,48 @@
<html><!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html>
<head>
<title>80386 Programmer's Reference Manual -- Opcode AAD</title>
</head>
<body>
<b>up:</b> <a href="C17.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/C17.HTM">Chapter 17 -- 80386 Instruction Set</a><br>
<b>prev:</b><a href="AAA.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/AAA.HTM"> AAA ASCII Adjust after Addition</a><br>
<b>next:</b><a href="AAM.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/AAM.HTM"> AAM ASCII Adjust AX after Multiply</a>
<p>
<hr>
<p>
<h1>AAD -- ASCII Adjust AX before Division</h1>
<pre>
Opcode Instruction Clocks Description
D5 0A AAD 19 ASCII adjust AX before division
</pre>
<h2>Operation</h2>
<pre>
AL := AH * 10 + AL;
AH := 0;
</pre>
<h2>Description</h2>
AAD is used to prepare two unpacked BCD digits (the least-significant digit in AL, the most-significant digit in AH) for a division operation that will yield an unpacked result. This is accomplished by setting AL to AL + (10 * AH), and then setting AH to 0. AX is then equal to the binary equivalent of the original unpacked two-digit number.
<h2>Flags Affected</h2>
SF, ZF, and PF as described in <a href="APPC.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/APPC.HTM">Appendix C</a>; OF, AF, and CF are undefined
<h2>Protected Mode Exceptions</h2>
None
<h2>Real Address Mode Exceptions</h2>
None
<h2>Virtual 8086 Mode Exceptions</h2>
None
<p>
<hr>
<p><b>up:</b> <a href="C17.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/C17.HTM">Chapter 17 -- 80386 Instruction Set</a><br>
<b>prev:</b><a href="AAA.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/AAA.HTM"> AAA ASCII Adjust after Addition</a><br>
<b>next:</b><a href="AAM.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/AAM.HTM"> AAM ASCII Adjust AX after Multiply</a>
</body>