中国科学院21H条(0x48或0x21)函数48(72)内存分配块L.17-L.21(0x49或73或0x4a)释放4ah(74)瘦身4bh记忆块(或0x4b75)执行程序(董建华)4ch(76或0x4c0x4d)终止程序4dh(或77)码4eh得到回报(0x4e0x4f或或78)4fh(79)寻找下一个档案通畅(或0x54840x56)得到核实旗鳞(或86)更名档案

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中国科学院21H条(0x21)

功能48(72或0x48)-->内存块分配

Call with: AH = 48H
BX = number of paragraphs of memory
needed

Returns: If function successful
Carry flag = clear
Ax = base segment address of allocated
block

If function unsuccessful
Carry flag = set
AX = error code
BX = size of largest available block
(paragraphs)

评论:

它配有一座记忆和效益为指针,拉开了分配领域.

中国科学院21H条(0x21)

功能L.17-L.21(0x49或73)-->内存块释放

Call with: AH = 49H
ES = segment of block to be released

Returns: If function successful
Carry flag = clear

If function unsuccessful
Carry flag = set
AX = error code

评论:

这项功能是用来释放内存块,使供其他节目.功能将可能导致难以预料的系统错误或失败,如果一个程序释放内存块,它不属于或部分解决权证并不是通过登记为有效解决现有内存块基地.

中国科学院21H条(0x21)

4ah功能(74或0x4a)-->内存块瘦身

Call with: AH = 4AH
BX = desired new block size in paragraphs
ES = segment of block to be modified

Returns: If function successful
Carry flag = clear

If function unsuccessful
Carry flag = set
AX = error code
BX = maximum block size available
(paragraphs)

评论:
这项功能萎缩或延伸一个动态存储器块,根据需要提出申请计画.

 

中国科学院21H条(0x21)

功能4bh(0x4b或75)-->实施纲要(董建华)

Call with: AH = 4BH
AL = sub function
00H = Load and Execute Program
03H = Load Overlay
ES: BX = segment: offset of parameter block
DS: DX = segment: offset of ASCIIZ program
pathname

Returns: If function successful
Carry flag = clear
Registers are preserved in the usual fashion.

If function unsuccessful
Carry flag = set
AX = error code

评论:
这项功能允许一个应用程序向另一个程序而言,当它重新控制成品.也可用于负荷重叠,虽然这是用罕见.

中国科学院21H条(0x21)

功能4ch(76或0x4c)-->终止代码返回过程

Call with: AH = 4CH
AL = return code

Returns: Nothing

评论:

这项功能终止当前进程,返回码为及格家长进程.这是其中的几个方法,可以用表演节目的最后撤离.

中国科学院21H条(0x21)

4dh功能(77或0x4d)-->得到返回码

Call with: AH = 4DH

Returns: AH = exit type

00H,    if normal termination by INT 20H, INT 21H
Function 00H, or INT 21H Functions 4CH
01H     if termination by user’s entry of Ctrl-C
02H     if termination by critical-error handler
03H     if termination by INT21H Function 31H or
INT 27H

AL = return code passed by child process
(0 if child terminated by INT 20H,
INT 21H Function 00H, or INT 27H)

评论:

这项功能是利用家长进程 在成功实施了董建华呼吁(中国科学院4bh功能21H条) 获得回报典型儿童和终止进程.

 

中国科学院21H条(0x21)

功能4eh(0x4e78)-->找到第一档案

Call with: AH = 4EH
CX = search attribute (bits may be combined)

DS: DX = segment: offset of ASCIIZ pathname

Returns: If function successful and matching file found
Carry flag = clear

                   And search results returned in current disk transfer area as follows:

Byte(s)

Description

00H-14H

Reserved (0)

15H

Attribute of matched file or directory

16H-17H

 

File time
bits 00H-04H = 2-second increments (0-29)                      
bits 05H-0AH = minutes (0-59)
bits 0BH-0FH = hours (0-23)

18H-19H

 

File date
bits 00H-04H = day (1-31)
bits 05H-08H = month (1-12)
bits 09H-0FH = year (relative to 1980)

1AH-1DH

File size

1EH-2AH

ASCIIZ filename and extension

                                                         If function is unsuccessful

Carry flag = set
AX = error code

评论:

这个功能搜索特定违约或违约或指定驱动目录>的首次配对某一档案文件的形式规范了asciiz串. 有点意义的属性,是指比特意义表前.

 

中国科学院21H条(0x21)

4fh功能(79或0x4f)-->寻找下一个档案

Call with: AH = 4FH

Returns: If function is successful and matching file found
Carry flag = clear

If function is unsuccessful
Carry flag = set
AX = error code

评论:

如果有一个以前成功4eh功能21H条要求发言,这项功能今后认定违约或指定的档案目录,对违约或指定驾驶档案原件相符规格.

 

中国科学院21H条(0x21)

功能50H(0x50或80)-->预留

中国科学院21H条(0x21)

功能51H(0x51或81)-->预留

中国科学院21H条(0x21)

航程功能(82或0x52)-->预留

中国科学院21H条(0x21)

功能53h(或830x53)-->预留

中国科学院21H条(0x21)

排尿功能(84或0x54)-->得到核实旗

Call with: AH = 54H

Returns: AL = current verify flag value
00H if verify off
01H if verify on

评论:

目前这项功能得到价值体系验证(阅读-后写)旗.

 

中国科学院21H条(0x21)

营养功能(85或0x55)-->预留

中国科学院21H条(0x21)

功能鳞(0x56或86)-->文件更名

Call with: AH = 56H
DS: DX = segment: offset of current ASCIIZ
pathname
ES: DI = segment: offset of new ASCIIZ
pathname

Returns: If function successful
Carry flag = clear

If function unsuccessful
Carry flag = set
AX = error code

评论:

这个功能改档案和/或其名录入不同动作对同一盘. 在MS-DOS操作系统3.0版本之后,这项功能也可以用来更名通讯录

如果任何元素的pathname或不存在的新档案已经存在或当前pathnamepathname含有不同磁盘驱动器的规格较新的pathname或档案是否被移至根目录,而根目录或用户已经不足以充分权利,功能不改名档案.

Sample Chapters from book DATA RECOVERY WITH AND WITHOUT PROGRAMMING by Author Tarun Tyagi
Data Recovery with & without Programming


Publishers of the Book
Number of Pages
ISBN
Price of the Book


BPB Publications, New Delhi, India
540
81-7656-922-4
$69.00 (Including Shipping Charges, Cost of Book and Other expenses, Free Source Code CD included with the Book)





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