Wie kodieren Sie Subtraktion in TASM

Question

Okay, also habe ich meine Codes aus dem Turbo Assembler Handbuch, das wir haben ... Ich habe versucht, Register zu tauschen, und es funktionierte nur für die inverse Subtraktion Beispiel 1-2 = -1 ... jetzt mein Problem in diesem Code ist, dass, wenn die erste Zahl, die größer als die zweite Zahl ist, ich nicht die richtige Antwort

;Subtract 
.MODEL Small 
.STACK 100h 
.DATA 
Start DB 13,10,'Subtract 2 numbers!$' 
FOne DB 13,10,'Enter first set number1: $' 
FTwo DB 13,10,'Enter first set number2: $' 
Diff1 DB 13,10,'Difference is: $' 



.CODE 
mov ax,@data 
mov ds,ax 
mov dx,OFFSET Start 
mov ah,09h 
int 21h 

mov dx, OFFSET FOne 
mov ah,09h 
int 21h 
mov ah,01h 
int 21h 
MOV BL,AL 
AND BL,0Fh 

mov dx, OFFSET FTwo 
mov ah,09h 
int 21h 
mov ah,01h 
int 21h 
AND AL,0Fh 

compare: 
cmp AL,BL 
jge reverse 
jnz normal 




normal: 
mov ah,00h 
SUB BL,AL 
AAS 
OR AX,3030h 
MOV BX,AX 

mov dx,OFFSET Diff1 
mov ah,09h 
int 21h 

mov dl,Bh 
mov ah,02h 
int 21h 
mov dl,Al 
int 21h 
mov ah,02h 
jmp exit 

reverse: 
mov ah,00h 
SUB AL,BL 
AAS 
OR AX,3030h 
MOV BX,AX 

mov dx,OFFSET Diff1 
mov ah,09h 
int 21h 

mov dl,"-" 
mov ah,02h 
int 21h 
mov dl,Bh 
mov ah,02h 
int 21h 
mov dl,Bl 
mov ah,02h 
int 21h 
jmp exit 


exit: 
mov ah,4ch 
int 21h 
END 

Answer 1

ok so i habe ich es erraten bekommen kann: D

;Subtract 
.MODEL Small 
.STACK 100h 
.DATA 
Start DB 13,10,'Subtract 2 numbers!$' 
FOne DB 13,10,'Enter first set number1: $' 
FTwo DB 13,10,'Enter first set number2: $' 

Diff1 DB 13,10,'Difference is: $' 
Rtry DB 13,10,'Enter new inputs?[y][n]: $' 

.CODE 
mov ax,@data 
mov ds,ax 
mov dx,OFFSET Start 
mov ah,09h 
int 21h 

mov dx, OFFSET FOne 
mov ah,09h 
int 21h 
mov ah,01h 
int 21h 
MOV BL,AL 
AND BL,0Fh 

mov dx, OFFSET FTwo 
mov ah,09h 

int 21h 
mov ah,01h 
int 21h 
MOV BH,AL 
AND AL,0Fh 

compare: 
cmp AL,BL 
jg reverse 
jnz normal 


normal: 
mov ah,00h 
SUB BL,BH 
MOV AL,BL 
AAS 
OR AX,3030h 
MOV BX,AX 

mov dx,OFFSET Diff1 
mov ah,09h 
int 21h 

mov dl,Bh 
mov ah,02h 
int 21h 
mov dl,Bl 
int 21h 
mov ah,02h 
jmp exit 

reverse: 
mov ah,00h 
SUB AL,BL 
MOV BH,AL 
AAS 
OR AX,3030h 
MOV BX,AX 

mov dx,OFFSET Diff1 
mov ah,09h 
int 21h 

mov dl,"-" 
mov ah,02h 
int 21h 
mov dl,Bh 
mov ah,02h 
int 21h 
mov dl,BL 
mov ah,02h 
int 21h 
jmp exit 


exit: 
mov ah,4ch 
int 21h 
END