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Create Simple Password Program In Assembly

Here's a simple password program written in Assembly language to verify users. Using A86 assembler to compile and run the program. If you want to create your very first assembly, read this post: http://codewall.blogspot.com/2011/06/create-your-first-assembly-program-step.html

Display: version 1



Source Code: version 1
001start: jmp main
002
003 den db 0ah, 0dh, "Access Denied. $"
004 grant db 0ah, 0dh, "Access Granted. $"
005 ent db "Enter Password: $"
006  
007 ctr db 0h
008    
009main proc
010
011  mov ctr,1
012     
013  mov ah,09h
014  lea dx,ent
015  int 21h
016   
017  cmp ctr,1
018  je loop1G
019press: 
020  cmp ctr,2
021  je loop2G
022   
023  cmp ctr,3 
024  je loop3G
025   
026press2: 
027  cmp ctr,2
028  je mislead1
029   
030  cmp ctr,3
031  je loopD
032          
033loop1G:   
034  mov ctr,2
035   
036  mov ah,01
037  int 21h
038   
039  cmp al,"V"
040  je press
041   
042  cmp al,"V"
043  jne press2 
044
045loop2G:
046  mov ctr,3
047   
048  mov ah,01
049  int 21h
050   
051  cmp al,"M"
052  je press
053   
054  cmp al,"M"
055  jne press2
056   
057mislead1:
058  mov ctr,3
059   
060  mov ah,01
061  int 21h
062   
063  cmp al,"M"
064  je press2
065   
066  cmp al,"M"
067  jne press2  
068   
069loop3G:
070  mov ctr,4
071   
072  mov ah,01
073  int 21h
074   
075  cmp al,"G"
076  je dispG   
077
078loopD: 
079  mov ctr,4
080   
081  mov ah,01
082  int 21h
083      
084  cmp al,"G"
085  je dispD
086   
087  cmp al,"G"
088  jne dispD
089       
090dispD:
091 mov ah,09h
092 lea dx,den
093 int 21h
094 int 20h
095
096dispG:
097 mov ah,09h
098 lea dx,grant
099 int 21h
100 int 20h
101
102main endp
103end start

Display: version 2 - using asterisk (*)



Source Code: version 2 - using asterisk (*)
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01start: jmp main
02
03 str1 db "password: $"
04    
05main proc
06
07  mov ah,09
08  lea dx,str1
09  int 21h
10   
11press:
12  mov ah,07
13  int 21h
14   
15  mov bl,al
16   
17  mov ah,02
18  mov dl,"*"
19  int 21h
20   
21  cmp bl,0dh
22  jne press
23   
24  int 20h
25
26main endp
27end start
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