still new to this and still learning
still lack of knowledge using gui turbo assembler
can someone help me with this problem? thankss

.MODEL SMALL
.stack 100h

sys_exit equ 1
sys_read equ 3
sys_write equ 4
stdin equ 0
stdout equ 1

.data
.code
start:
msg1 db “enter a number: “, len1 equ $- msg1

msg2 db "enter a number: ",  len2 equ $- msg2

msg3 db "the sum is ", len3 equ $- msg3

    num1 resb 2
    num2 resb 2
    res resb 1

.bss

    section .text
    global_start
    
    
    
    mov eax,sys_write
    mov ebx,stdout
    mov ecx,msg1
    mov edx,len1
    int 21h
    
    mov eax,sys_read
    mov ebx,stdin
    mov ecx,num1
    mov edx,2
    int 21h
    
    mov eax,sys_write
    mov ebx stdout
    mov ecx,msg2
    mov edx,len2
    int 21h
   
    mov eax,sys_read
    mov ebx,stdin
    mov ecx,num2
    mov edx,2
    int 21h
    
    mov eax,sys_write
    moc ebx,stdout
    mov ecx,msg3
    mov edx,len3
    int 21h
    
    mov eax,[num1]
    sub eax,'0'
    
    mov ebx, [num2]
    sub ebx,'0'
    
    add eax,ebx
    add eax,'0'
    
    mov [res],eax
    
    mov eax,sys_write
    mov ebx,stdout
    mov ecx,res
    mov edx,1
    int 21h
    
    exit:
    
    mov eax,sys_exit
    xor ebx,ebx
    int 21h