下列程序段中的每条指令执行完后,AX寄存器及CF,SF,ZF,OF的内容是什么??
mov ax,0
dec ax AX=0FFFFH sf=1 其余位为0
add ax,7fffh ax=7ffeh cf=1 其余位为0
add ax,2 ax=8000h sf=1 of=1 其余位为0
not ax ax=7fffh not指令不影响条件标志,所以不用判断
sub ax,0ffffh ax=8000h sf=1 of=1 cf=1 zf=0
add ax,8000h ax=0h zf=1 of=1 cf=1 sf=0
s...
- [lijangwei] 那上面的意思不是说,先那个都可以了吗 03/29 16:47
- [游客] XP,03,2K ----------- 都是以NT为核心的 03/29 10:40
- [游客] 那么各个项都代表什么意思啊!我们通常说的NT是不是代表现在所使用的操作系统!如:XP,03,2K 03/29 10:32
- [wdm] 选第一个吧。 好像是操作系统核心的选择。现在应该都是NT的。然后+个dos，应该就是他了。 03/29 10:26
- [mouse] 评论都不错，收藏此贴吧 o(∩_∩)o... 03/28 09:22
- [游客] 女人是社会的另一个主体，不管你愿或不愿。所以女人应该有种责任感。 03/27 21:39
- [bug] 支持， 说的太对了。^_^ 顶起。 03/27 20:38
- [游客] 经典！！！ 03/27 20:32
- [游客] 唉！俺27了，可惜没有人死心塌地的跟着俺呐。 03/27 19:31
- [游客] \n是换行，英文是linefeed，ASCII码是0xA。 \r是回车，英文是carriage r 03/27 19:00
- [游客] afdsfagg 03/15 10:38
[2008-02-26 16:31] 一道问题
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[2007-12-12 17:39] 实验16
assume cs:code
code segment
start:
mov ax,code
mov ds,ax
mov si,offset setscreen
mov ax,0
mov es,ax
mov di,200h
mov cx,offset setscreenend-offset setscreen
cld
rep movsb
mov es:[7ch*4],word ptr 200h
mov es:[7ch*4+2],word ptr 0
mov ax,4c00h
int 21h
org 200h
setscreen: jm...
code segment
start:
mov ax,code
mov ds,ax
mov si,offset setscreen
mov ax,0
mov es,ax
mov di,200h
mov cx,offset setscreenend-offset setscreen
cld
rep movsb
mov es:[7ch*4],word ptr 200h
mov es:[7ch*4+2],word ptr 0
mov ax,4c00h
int 21h
org 200h
setscreen: jm...
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[2007-12-10 17:55] 检测题16.1
assume cs:code,ds:data
code segment
a db 1,2,3,4,5,6,7,8
b dw 0
start:mov si,0
mov cx,8
s:
mov ax,a[si]
add cs:[16],ax
adc cs:[18],0
add si,2
loop s
mov ax,4c00h
int 21h
code ends
end start...
code segment
a db 1,2,3,4,5,6,7,8
b dw 0
start:mov si,0
mov cx,8
s:
mov ax,a[si]
add cs:[16],ax
adc cs:[18],0
add si,2
loop s
mov ax,4c00h
int 21h
code ends
end start...
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[2007-12-10 17:16] 实验15
assume cs:code
stack segment
db 128 dup (0)
stack ends
code segment
start:
mov ax,stack
mov ss,ax
mov sp ,128
push cs
pop ds
mov ax,0
mov es,ax
mov di,204h
mov si,offset int9
mov cx,offset int9end-offset int9
cld
rep movsb
push es:[4*9]
pop es:[200h]
push es:...
stack segment
db 128 dup (0)
stack ends
code segment
start:
mov ax,stack
mov ss,ax
mov sp ,128
push cs
pop ds
mov ax,0
mov es,ax
mov di,204h
mov si,offset int9
mov cx,offset int9end-offset int9
cld
rep movsb
push es:[4*9]
pop es:[200h]
push es:...
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[2007-12-09 14:34] 实验14
assume cs:code
code segment
array db 9,8,7,4,2,0
start:
mov ax,code
mov ds,ax
mov di,offset array
mov si,160*12+20*2
mov cx,6
s:
push cx
mov al,[di]
out 70h,al
in al,71h
mov ah,al
mov cl,4
shr ah,cl
and al,00...
code segment
array db 9,8,7,4,2,0
start:
mov ax,code
mov ds,ax
mov di,offset array
mov si,160*12+20*2
mov cx,6
s:
push cx
mov al,[di]
out 70h,al
in al,71h
mov ah,al
mov cl,4
shr ah,cl
and al,00...
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[2007-12-09 12:20] 14.1
(1)
mov al,2
out 70h,al
in al,71h
(2)
mov al,2
out 70h,al
mov al,0
out 71h,al...
mov al,2
out 70h,al
in al,71h
(2)
mov al,2
out 70h,al
mov al,0
out 71h,al...
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[2007-12-08 15:24] 实验13(3)
assume cs:code
code segment
s1: db 'Good,btter,best,','$'
s2: db 'Never let it rest,','$'
s3: db 'Till good is better,','$'
s4: db 'And better,best.','$'
s: dw offset s1,offset s2,offset s3,offset s4
row: db 2,4,6,8
start :
mov ax,cs
mov ds,ax
mov bx,offset s
mo...
code segment
s1: db 'Good,btter,best,','$'
s2: db 'Never let it rest,','$'
s3: db 'Till good is better,','$'
s4: db 'And better,best.','$'
s: dw offset s1,offset s2,offset s3,offset s4
row: db 2,4,6,8
start :
mov ax,cs
mov ds,ax
mov bx,offset s
mo...
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[2007-12-08 14:50] 实验13(2)
assume cs:code
code segment
start:
mov ax,code
mov ds,ax
mov ax,0
mov es,ax
mov di,200h
mov si,offset d0
mov cx,offset d0ret-offset d0
cld
rep movsb
mov ax,0
mov es,ax
mov word ptr es:[4*7ch],200h
mov word ptr es:[4*7ch+2...
code segment
start:
mov ax,code
mov ds,ax
mov ax,0
mov es,ax
mov di,200h
mov si,offset d0
mov cx,offset d0ret-offset d0
cld
rep movsb
mov ax,0
mov es,ax
mov word ptr es:[4*7ch],200h
mov word ptr es:[4*7ch+2...
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[2007-12-08 11:47] 实验13(1)
assume cs:code
code segment
mov ax,code
mov ds,ax
mov ax,0
mov es,ax
mov di,200h
mov si,offset d0
mov cx,offset dret-offset d0
cld
rep movsb
mov ax,0
mov es,ax
mov es:[7ch*4],word ptr 200h
...
code segment
mov ax,code
mov ds,ax
mov ax,0
mov es,ax
mov di,200h
mov si,offset d0
mov cx,offset dret-offset d0
cld
rep movsb
mov ax,0
mov es,ax
mov es:[7ch*4],word ptr 200h
...
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[2007-12-07 18:20] 实验12
assume cs:code
code segment
start:
mov ax,code
mov ds,ax
mov ax,0
mov es,ax
mov di,200h
mov si,offset d0
mov cx,offset d0ret-offset d0
cld
rep movsb
mov ax,0
mov es,ax
mov word ptr es:[0*4],200h
mov word ptr es:[0*4+2],0 ...
code segment
start:
mov ax,code
mov ds,ax
mov ax,0
mov es,ax
mov di,200h
mov si,offset d0
mov cx,offset d0ret-offset d0
cld
rep movsb
mov ax,0
mov es,ax
mov word ptr es:[0*4],200h
mov word ptr es:[0*4+2],0 ...
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