0000, Assembly - rextester

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;nasm 2.11.08

section .data
    msg db "Enter 4 digit hex no",10,13
    msglen equ $-msg
    
    msg1 db "Converted no is:",10,13
    msglen1 equ $-msg1
    
    cnt db 0
    
section .bss
    num resb 5
    rem resb 1
    
    %macro display 2
    mov eax,4
    mov ebx,1
    mov ecx,%1
    mov edx,%2
    int 80h
    %endmacro
    
    %macro accept 2
    mov eax,3
    mov ebx,0
    mov ecx,%1
    mov edx,%2
    int 80h
    %endmacro
    
section .text

global _start
        
        _start:
                display msg,msglen
                accept num,5
                mov esi,num
                call ascii_original
                mov [num],ebx
                display msg1,msglen1
                mov eax,[num]
                mov ebx,10
                
          l1:   mov edx,0
                div ebx
                push dx
                inc byte[cnt]
                cmp ax,0
                jnz l1
                
          l2:   pop dx
                add dl,30h
                mov [rem],dl
                display rem,1
                dec byte[cnt]
                jnz l2
                
                mov eax,1
                mov ebx,0
                int 80h
                
                
  ascii_original:
                  mov eax,0
                  mov ebx,0
                  mov ecx,4
                  
             up1: rol bx,04
                  mov al,[esi]
                  cmp al,39h
                  jbe down1
                  sub al,07
                  
            down1:sub al,30h
                  add bx,ax
                  inc esi
                  loop up1
                  
           ret

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Compilation time: 0.24 sec, absolute running time: 10.04 sec, cpu time: 0 sec, memory peak: 0 Mb, absolute service time: 10,29 sec