相对跳出范围

Question

每当我输入 CMP 八进制“3 ”时，我都会收到消息“(76)Relative jump out of range by 000Eh bytes”和(79)Relative jump out of range by 0007h bytes”。我应该一直做到第 7 次八进制数但是当我尝试执行第三个八进制数时它总是给我一个错误。我只能做 0,1 和 2，直到它给我一个错误。我不知道我应该做什么。我我已经尽我所能尝试了一切，但我仍然无法得到任何结果。请帮助我。我是组装新手。PS 我正在使用 DOSBox 0.74

.Model small

.data
txt1 db "Octal to Binary Converter$"
txt2 db "Enter an Octal Symbol: $"
title0 db "000$"
title1 db "001$"
title2 db "010$"
title3 db "011$"
title4 db "100$"
title5 db "101$"
title6 db "110$"
title7 db "111$"

mess db "Press ESC to exit...$"
invalid db "Input is invalid. Try again.$"
keypress db ?
octal db ?

.code
Start:
Mov AX, @data
Mov ds, ax

sys_st:
Mov AH, 6
Mov AL, 0
Mov BH, 15
Mov ch, 0
Mov cl, 0
Mov DH, 100
Mov DL , 100
Int 10H

Mov AH, 2
Mov BH, 0
Mov DL, 5
Mov DH, 5
Int 10H 

Mov AH, 9
Lea DX, txt1 
Int 21H

JMP sys_st2

sys_st2:
Mov AH, 2
Mov BH, 0
Mov DL, 5
Mov DH, 8
Int 10H 

Mov AH, 9
Lea DX, txt2 
Int 21H 

Mov AH, 1
Int 21H
Mov octal, AL 

CMP octal, '0'
JE sys_0

CMP octal, '1'
JE sys_1

CMP octal, '2'
JE sys_2

CMP octal, '3'
JE sys_3


CMP octal, '0'
JNE sys_invalid

CMP octal, '1'
JNE sys_invalid

CMP octal, '2'
JNE sys_invalid

CMP octal, '3'
JNE sys_invalid

sys_0:
Mov AH, 2
Mov BH, 0
Mov DL, 11
Mov DH, 11 
Int 10H

Mov AH, 9
Lea DX, title0 
Int 21H 

Mov AH, 2 
Mov BH, 0
Mov DL, 5
Mov DH, 15 
Int 10H 

JMP sys_exit

sys_1:
Mov AH, 2 
Mov BH, 0
Mov DL, 11
Mov DH, 11 
Int 10H 

Mov AH, 9
Lea DX, title1
Int 21H 

Mov AH, 2 
Mov BH, 0
Mov DL, 5
Mov DH, 15 
Int 10H 

JMP sys_exit

sys_2:
Mov AH, 2 
Mov BH, 0
Mov DL, 11
Mov DH, 11 
Int 10H 

Mov AH, 9
Lea DX, title2
Int 21H 

Mov AH, 2 
Mov BH, 0
Mov DL, 5
Mov DH, 15 
Int 10H 

JMP sys_exit

sys_3:
Mov AH, 2 
Mov BH, 0
Mov DL, 11
Mov DH, 11 
Int 10H 

Mov AH, 9
Lea DX, title3
Int 21H 

Mov AH, 2 
Mov BH, 0
Mov DL, 5
Mov DH, 15 
Int 10H 

JMP sys_exit

sys_invalid: 
Mov AH, 2 
Mov BH, 0
Mov DL, 5 
Mov DH, 11 
Int 10H 

Mov AH, 9
Lea DX, invalid 
Int 21H 

Mov AH, 1 
Int 21H 
JMP sys_st 

sys_exit: 

Mov AH, 2
Mov BH, 0
Mov DL, 5
Mov DH, 14
Int 10H 

Mov AH, 9
Lea DX, mess 
Int 21H 

Mov AH, 1 
Int 21H 
Mov keypress, AL 

CMP keypress, 27
JNE sys_exit 

JMP exit 

Exit: 
Mov AH, 4ch 
Int 21H 
End Start 

Answer 1

.386向您的文件添加一条指令，以便能够使用 80386 引入的具有更大偏移量的相对跳转指令。或者，找到有问题的跳转并将其替换为如下内容：

   jnz foo ; this jump is too long

用。。。来代替

   jz bar ; opposite conditional
   jmp foo ; unconditional jumps can have larger offsets
bar:
   ...