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中国DOS联盟论坛 » DOS疑难解答 & 问题讨论（解答室） » Re: MS-DOS引导程序剖析

ko20010214
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发帖 1628
注册 2002-10-16
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『楼主』: Re: MS-DOS引导程序剖析

发信人: jan1 (精灵), 信区: DOS
标  题: Re: MS-DOS引导程序剖析
发信站: BBS 水木清华站 (Thu Sep 11 19:48:24 1997)

【在 cq (七支居士) 的大作中提到: 】
: 哪位行家顺手post上来, 不胜感激. 我看过的书上没有说明过.
以下为一个硬盘的分区结构，分为一个pri和一个ext， ext中包含一个logical
C:\>debug
-a100
1876:0100 mov ax,201
1876:0103 mov bx,7c00
1876:0106 mov cx,1    ; col 0, sector 1
1876:0109 mov dx,81    ; Second hard disk, head 0
1876:010C int 13
1876:010E int 3
1876:010F
-g=100

AX=0050  BX=7C00  CX=0001  DX=0081  SP=FFEE  BP=0000  SI=0000  DI=0000
DS=1876  ES=1876  SS=1876  CS=1876  IP=010E NV UP EI PL NZ NA PO NC
1876:010E CC          INT    3
-d7d80
1876:7D80  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7D90  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7DA0  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7DB0  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 01 ................
                                                      ^^ dh for pri-partition
1876:7DC0  01 00 06 3F 60 F3 20 00-00 00 E0 9F 0F 00 00 00 ...?`. .........
         ^^^^^cx for pri-partition                   ^^ dh for ext-partition
1876:7DD0  41 F4 05 3F E0 F1 00 A0-0F 00 00 F0 0F 00 00 00 A..?............
         ^^^^^cx for ext-partition
1876:7DE0  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7DF0  00 00 00 00 00 00 00 00-00 00 00 00 00 00 55 AA ..............U.
-a106
1876:0106 mov cx,f441 ;
1876:0109
-g=100                ; reading col:sec  f441, head 0, this is ext-partition

AX=0050  BX=7C00  CX=F441  DX=0081  SP=FFEE  BP=0000  SI=0000  DI=0000
DS=1876  ES=1876  SS=1876  CS=1876  IP=010E NV UP EI PL NZ NA PO NC
1876:010E CC          INT    3
-d7d80
1876:7D80  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7D90  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7DA0  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7DB0  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 01 ................
                                                      ^^ dh for logical driver
1876:7DC0  41 F4 06 3F E0 F1 20 00-00 00 E0 EF 0F 00 00 00 A..?.. .........
         ^^^^^cx for logical driver
1876:7DD0  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7DE0  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
1876:7DF0  00 00 00 00 00 00 00 00-00 00 00 00 00 00 55 AA ..............U.

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※ 来源:·BBS 水木清华站 bbs.net.tsinghua.edu.cn·[FROM: 162.105.170.149]

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