Principles of Computer Organization Assembly Language

1. Add from 1 to 100

   ;从一加到一百
   	mov ax,0
   	mov bx,0
   	a2:add ax,bx
   	inc bx 
   	cmp bx,100
   	jle a2

2. Add 1 to 100 to output hexadecimal

    ;输出从一加到一百的结果以十六进制输出
    mov ch,4
    mov ax,0
    mov bx,1
 a2:add ax,bx
    inc bx
    cmp bx,100
    jle a2
    mov bx,ax 
    mov cl,4
 a3:rol bx,cl
    mov al,bl
    and al,0fh
    add al,30h
   cmp al,39h
   jle a4
   add al,7
  a4:mov dl,al
    mov ah,2
    int 21h
    dec ch
    cmp ch,1
    jge a3

3. Output 26 uppercase letters

    ;输出26个大写字母
    mov ch,1
    mov bl,'A'
    a2:mov dl,bl
    mov ah,2
    int 21h
    inc bl
    inc ch
    cmp ch,26
    jle a2

4. Output 52 uppercase and lowercase letters (only one cycle is used)

   ;输出52个大小写小字母（只用一个循环）
   mov ch,1
   mov bl,'A'
   a2:mov dl,bl
   mov ah,2
   int 21h
   mov cl,bl
   add cl,20h
   mov dl,cl
   mov ah,2
   int 21h
   inc bl
   inc ch
   cmp ch,26
   jle a2

5. Input a character from the keyboard and output the corresponding ASCII code

   mov ch,8
    mov ah,1
    int 21h
    mov bl,al
    a4:test bl,80h
    jz a2
    mov dl,'1'
    mov ah,2
    int 21h
    jmp a3
    a2:mov dl,'0'
    mov ah,2
    int 21h
    a3:rol bl,1
    dec ch
    cmp ch,1
    jge a4

6. Output the input characters without echo

 ;将输入的无回显的字符输出
   mov dx,offset str1
   mov ah,9
   int 21h
  a5:mov bx,offset str2
  a4:mov ah,7
  int 21h
  cmp al,0dh
  jz a2
  mov dh,al
  mov ah,2
  mov dl,'*'
  int 21h
  mov [bx],dh
  inc bx
  jmp a4
  a2:mov byte ptr [bx],'$'
  mov dx,offset str2
    mov ah,9
    int 21h

7. Output the data segment code in ASCII form

 ;将数据段代码以ASCII形式输出
    mov dh,11
    mov si,offset st1
    a6:mov bl,[si]
    mov ch,2
    mov cl,4
    a3:rol bl,cl
    mov al,bl
    and al,0fh
    add al,30h
    cmp al,39h
    jle a4
    add al,7
    a4:mov dl,al
    mov ah,2
    int 21h
    dec ch
    cmp ch,1
    jge a3
    inc si
    mov ah,2
    mov dl,20h
    int 21h
    dec dh
    cmp dh,1
    jge a6