因为'W'<'v'，满足
cmp al,'v'
jbe jia
条件，按小写字母处理了。也就是未执行到
cmp al,'W'
jae jian
解决办法：先判断大写的、后判断小写的。
我写了一个，仅供参考。
Code Segment
Assume CS:Code,DS:Code
; －－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
; 功能：显示指定地址（Str_Addr）的字符串
; 入口：
; Str_Addr＝字符串地址（要求在数据段）
; 用法: Output Str_Addr
; 用法举例：Output PromptStr
Output MACRO Str_Addr
push ax
lea dx,Str_Addr
mov ah,9
int 21h
pop ax
EndM
; －－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
Prompt_Str db 'Please input a string:',13,10,'$'
Press_Key db 13,10,13,10,'The complated Press any key to exit$'
Start: push cs
pop ds ;使数据段与代码段同段
Output Prompt_Str ;提示输入字符串
lea dx,Buffer
mov ah,0ah
int 21h
lea si,Buffer[1]
cld
lodsb
mov cl,al
xor ch,ch
jcxz Exit_Proc
mov ah,2
mov dl,13
int 21h
mov dl,10
int 21h
xx: lodsb
mov ah,al
and ah,0dfh ;视为字母字符，转换成大写来判断
cmp ah,'A'
jb Disp_Chr ;非字母字符，直接显示
cmp ah,'Z'
ja Disp_Chr ;非字母字符，直接显示
cmp ah,'W'
jb $+4 ;'A'～'V'，正常处理
sub al,26 ;'W'～'Z'，特殊处理
add al,4
Disp_Chr: mov ah,2
mov dl,al
int 21h
loop xx
; －－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
Exit_Proc: Output Press_Key ;提示 *** 作完成，按任意键结束程序
mov ah,1
int 21h
mov ah,4ch ;结束程序
int 21h
Buffer db 100
Code ENDS
END Start ;编译到此结束
data_seg segment
car db 2
db 40h,0bh,0,0
db 02ah,0bh,0,1
jeep db 2
db 40h,0bh,0,0
db 02ah,0bh,0,-1
star db 2
db 40h,0bh,0,0
db 02ah,0,0,1
star1 db 2
db 40h,0bh,0,0
db 02ah,0,0,-1
star2 db 26
db 40h,0bh,0,0
db 02ah,0bh,0,1
db 40h,0bh,-1,-3
db 02ah,0bh,0,1
db 40h,0bh,2,-1
db 02ah,0bh,0,1
db 40h,0bh,1,-3
db 02ah,0bh,0,1
db 40h,0bh,-4,-1
db 02ah,0bh,0,1
db 40h,0bh,-1,-3
db 02ah,0bh,0,1
db 40h,0bh,6,-1
db 02ah,0bh,0,1
db 40h,0bh,1,-3
db 02ah,0bh,0,1
db 40h,0bh,-8,-1
db 02ah,0bh,0,1
db 40h,0bh,-1,-3
db 02ah,0bh,0,1
db 40h,0bh,10,-1
db 02ah,0bh,0,1
db 40h,0bh,1,-3
db 02ah,0bh,0,1
db 40h,0bh,-12,-1
db 02ah,0bh,0,1
star3 db 26
db 40h,0bh,0,0
db 02ah,0bh,0,-1
db 40h,0bh,-1,3
db 02ah,0bh,0,-1
db 40h,0bh,2,1
db 02ah,0bh,0,-1
db 40h,0bh,1,3
db 02ah,0bh,0,-1
db 40h,0bh,-4,1
db 02ah,0bh,0,-1
db 40h,0bh,-1,3
db 02ah,0bh,0,-1
db 40h,0bh,6,1
db 02ah,0bh,0,-1
db 40h,0bh,1,3
db 02ah,0bh,0,-1
db 40h,0bh,-8,1
db 02ah,0bh,0,-1
db 40h,0bh,-1,3
db 02ah,0bh,0,-1
db 40h,0bh,10,1
db 02ah,0bh,0,-1
db 40h,0bh,1,3
db 02ah,0bh,0,-1
db 40h,0bh,-12,1
db 02ah,0bh,0,-1
char_cnt1 dw
pointer1 dw
line_on1 db
col_on1 db
char_cnt2 dw
pointer2 dw
line_on2 db
col_on2 db
char dw
col db
col0 db
col00 db
col01 db
count db
count0 db
count1 db
count2 db
char0 db
char1 db
char01 db
char2 db
line1 db
col1 db
pot1 dw
line2 db
col2 db
pot2 dw
count_cx db
data_seg ends
;---------------------------------------
code_seg segment
assume cs:code_seg,ds:data_seg
main proc far
push ds
sub ax,ax
sub cx,cx
push ax
push cx
mov ax,data_seg
mov ds,ax
mov col,2
mov col0,2
mov col01,2
mov char0,2
mov char01,2
mov count,5
mov char1,76
mov char2,2
mov count0,4
mov count1,2
mov count_cx,2
again:
lea di,star
mov dh,3
mov dl,2
call move_shape
dec count0
lea di,star1
mov dh,17
mov dl,76
call move_shape
dec count0
lea di,jeep
mov dh,4
mov dl,2
call move_shape
dec count0
lea di,car
mov dh,16
mov dl,76
call move_shape
;------------------------------
mov count0,13
again1:
mov col,2
mov col0,2
mov col01,2
mov char0,2
mov char01,2
mov count,5
mov char1,76
mov char2,2
mov count1,2
mov count_cx,2
lea di,star2
mov dh,10
mov dl,40
call move_shape1
lea di,star3
mov dh,10
mov dl,38
call move_shape2
call must_2
dec count0
jne again1
pop cx
ret
main endp
;----------------------------
clear_screen proc near
push ax
push bx
push cx
push dx
mov ah,6
mov al,0
mov ch,0
mov cl,0
mov dh,24
mov dl,79
mov bh,7
int 10h
pop dx
pop cx
pop bx
pop ax
ret
clear_screen endp
;-------------------------------------
move_shape proc near
push ax
push bx
push cx
push dx
push di
mov ah,0fh
int 10h
sub ch,ch
mov cl,[di]
inc di
mov char_cnt1,cx
mov pointer1,di
mov line_on1,dh
mov col_on1,dl
plot_next:
add dh,[di+2]
add dl,[di+3]
cmp count0,3
je exit2
cmp count0,2
je exit9
cmp count0,1
je exit10
cmp dl,78
jb mov_crsr
jmp exit1
exit2: cmp dl,1
jnb mov_crsr
jmp exit1
exit9: cmp dh,17
jb mov_crsr
jmp exit1
exit10: cmp dh,3
ja mov_crsr
exit1: pop di
pop dx
pop cx
pop bx
pop ax
ret
mov_crsr:
mov ah,2
int 10h
mov al,[di]
mov bl,[di+1]
push cx
mov cx,1
mov ah,09
int 10h
pop cx
add di,4
loop plot_next
exit4: dec count
je exit3
call dly_qrtr
jmp exit4
exit3: call erase
mov count,5
jmp short plot_next
move_shape endp
;----------------------------------------
;-------------------------------------
move_shape1 proc near
push ax
push bx
push cx
push dx
push di
mov ah,0fh
int 10h
sub ch,ch
mov cl,[di]
inc di
mov char_cnt1,cx
mov pointer1,di
mov line_on1,dh
mov col_on1,dl
mov char,cx
pop di
pop dx
pop cx
pop bx
pop ax
ret
move_shape1 endp
;----------------------------
move_shape2 proc near
push ax
push bx
push cx
push dx
push di
mov ah,0fh
int 10h
sub ch,ch
mov cl,[di]
inc di
mov char_cnt2,cx
mov pointer2,di
mov line_on2,dh
mov col_on2,dl
mov char,cx
pop di
pop dx
pop cx
pop bx
pop ax
ret
move_shape2 endp
;-----------------------------------------
must_2 proc near
push ax
push bx
push cx
push dx
push di
mov ah,0fh
int 10h
exit41: sub cx,cx
mov col,2
mov col01,2
mov char0,2
mov char01,2
mov cx,char_cnt1
mov di,pointer1
mov dh,line_on1
mov dl,col_on1
mov char,cx
jmp plot_next1
exit31: sub cx,cx
mov cx,char_cnt2
mov di,pointer2
mov dh,line_on2
mov dl,col_on2
mov char,cx
jmp plot_next1
;------------------------------------------
exit61: call dly_qrtr
mov char0,2
mov char01,2
mov col01,2
mov col,2
mov dl,col_on2
cmp dl,38
je exit71
cmp dl,32
je exit71
cmp dl,26
je exit71
cmp dl,20
je exit71
cmp dl,14
je exit71
cmp dl,8
je exit71
cmp dl,2
je exit72
call dly_qrtr
call dly_qrtr
call dly_qrtr
call dly_qrtr
call erase1
cmp col0,26
je exit81
add col0,4
exit81: jmp exit41
exit71: add col_on1,2
sub col_on2,2
cmp col0,26
je exit81
add col0,4
jmp exit41
exit02: jmp exit61
exit72: jmp exit21
exit01: mov line2,dh
mov col2,dl
add di,4
mov pot2,di
mov dl,col01
cmp col0,dl
je exit02
add col01,4
mov col,4
mov char01,2
dec char01
jmp exit410
exit21: pop di
pop dx
pop cx
pop bx
pop ax
ret
exit410: mov dh,line1
mov di,pot1
mov dl,col1
jmp plot_next1
exit310: mov dh,line2
mov di,pot2
mov dl,col2
jmp plot_next1
exit03: jmp exit01
;----------------------------------------
plot_next1: add dh,[di+2]
add dl,[di+3]
mov ah,2
int 10h
mov ah,8
int 10h
cmp dl,3
jb exitx0
cmp dl,76
jae exitx0
cmp ah,0bh
je exitx
cmp ah,0dh
je exitx2
cmp ah,0ah
je exitx3
cmp ah,0eh
je exitx4
exitx0: mov al,[di]
mov bl,[di+1]
jmp exitx1
exitx: mov bl,0dh
jmp exitx1
exitx2: mov bl,0ah
jmp exitx1
exitx3: mov bl,0eh
jmp exitx1
exitx4: mov bl,0ch
exitx1: push cx
mov cx,1
mov ah,09
int 10h
pop cx
dec col
je exit51
add di,4
jmp plot_next1
exit51: cmp char01,0
je exit03 ;-------------
cmp char01,1
je exit12
cmp char0,1
je exit03 ;--------------------
mov line1,dh
mov col1,dl
add di,4
mov pot1,di
mov col,2
dec char0
jmp exit31
exit12: mov line1,dh
mov col1,dl
add di,4
mov pot1,di
dec char01
mov col,4
jmp exit310
must_2 endp
;--------------------------------------------
erase proc near
cmp count0,4
jne exit6
add col_on1,2
jmp exit
exit6: cmp count0,3
jne exit7
sub col_on1,2
jmp exit
exit7: cmp count0,2
jne exit8
inc line_on1
jmp exit
exit8: cmp count0,1
jne exit
dec line_on1
exit: mov dh,line_on1
mov dl,col_on1
mov cx,char_cnt1
mov di,pointer1
ret
erase endp
;-----------------------------------------
erase1 proc near
sub cx,cx
mov cx,char_cnt1
mov di,pointer1
mov dh,line_on1
mov dl,col_on1
mov char,cx
jmp erase_next1
exit62: sub cx,cx
mov cx,char_cnt2
mov di,pointer2
mov dh,line_on2
mov dl,col_on2
mov char,cx
jmp erase_next1
exit011: mov line2,dh
mov col2,dl
add di,4
mov pot2,di
mov dl,col01
cmp col0,dl
je exit021
add col01,4
mov col,4
mov char01,2
dec char01
jmp exit4101
exit4101: mov dh,line1
mov di,pot1
mov dl,col1
jmp erase_next1
exit3101: mov dh,line2
mov di,pot2
mov dl,col2
jmp erase_next1
exit012: jmp exit011
exit021: jmp left
erase_next1:
add dh,[di+2]
add dl,[di+3]
mov ah,2
int 10h
mov al,''
mov bl,0
push cx
mov cx,1
mov ah,9
int 10h
pop cx
;-------------------------------------
dec col
je exit0
add di,4
jmp erase_next1
exit0: cmp char01,0
je exit012 ;-------------
cmp char01,1
je exit121
cmp char0,1
je exit012 ;--------------------
mov line1,dh
mov col1,dl
add di,4
mov pot1,di
mov col,2
dec char0
jmp exit62
exit121: mov line1,dh
mov col1,dl
add di,4
mov pot1,di
dec char01
mov col,4
jmp exit3101
left: add col_on1,2
sub col_on2,2
ret
erase1 endp
;------------------------------------------
dly_qrtr proc near
push cx
push dx
mov dx,25
dll: mov cx,65530
dl2: loop dl2
dec dx
jnz dll
pop dx
pop cx
ret
dly_qrtr endp
;---------------------------------------
code_seg ends
end main
;---------------------------------
写一段给你吧～ 以 7ch中断为例 间隔显示时间自己可以修改～ 在 dally里
assume cs:code
stack segment
db 128 dup(0)
stack ends
code segment
start: push cs
pop ds
mov si,offset s8
mov ax,0
mov es,ax
mov di,200h ;ds:si 指向源地址 es:si指向目的地址
mov cx, offset s9-offset s8
cld
rep movsb
cli
mov word ptr es:[7ch4],200h
mov word ptr es:[7ch4+2],0 ;设置中断向量表
sti
int 7ch ;------->调用安装好的中断例程～ 测试～
mov ax,4c00h
int 21h
s8: push ax
push es
push di
push cx
mov ax,0b800h
mov es,ax
mov di,12160+402
mov cx,9
mov al,31h
s: mov byte ptr es:[di],al
mov byte ptr es:[di+1],2
call dally
inc al
cmp al,99h
ja s1
cmp cx,1
je s1
loop s
s1:mov cx,9
mov al,31h
jmp short s
dally: push ax
push bx
mov ax,0 ;延迟输出时间在此设置
mov bx,5000h
s2: sub ax,1
sbb bx,0
cmp ax,0
jne s2
cmp bx,0
jne s2
pop bx
pop ax
ret
s9: pop cx
pop di
pop es
pop ax
iret
code ends
end start
AREA StrCopy, CODE, READONLY
ENTRY ; mark the first instruction to call
start
LDR r1, =srcstr ; pointer to first string
LDR r0, =dststr ; pointer to second string
BL strcopy ;
call subroutine to do copy
stop
MOV r0,
#0x18
LDR r1,
=0x20026
SWI
0x123456
strcopy
LDRB r2, [r1],#1
STRB r2, [r0],#1
CMP r2, #0
BNE strcopy
MOV pc,lr ;
Return
AREA Strings, DATA, READWRITE
srcstr DCB First string - source,0
dststr DCB Second string - destination,0
END
试试，
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