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Why isn't this printing

Why isn't this printing

Why isn't this printing

Basically this program takes two numbers and adds them together, but I can't get it to print the sum.  Any help would be appreciated!!

section .data

    big db "Too Big", 0xA
    blen equ $ - big

section .bss

    chr resb 2
    sum resw 1
    num resw 1

section .text
    global main


    mov ax, 0
    mov [sum], ax

    mov eax, 3
    mov ebx, 0
    mov ecx, chr
    mov edx, 2
    int 0x80

    cmp byte [chr], 0x30
    jb  e1
    cmp byte [chr], 0x39
    ja e1

    mov ax, [sum]
;    imul  ax, 10
    mov bx, 0
    mov bl, [chr]
    sub bl, 0x30
    add ax, bx
    mov [sum], ax
    jmp begin

    cmp word [sum], 10
    jb e3
    mov ecx, big
    mov edx, len
    jmp e2

    mov ecx, sum
    mov edx, 2

    mov eax, 4
    mov ebx, 1
    int 0x80

    mov eax, 1
    mov ebx, 0
    int 0x80

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