BITS 16
CPU 8086

org 0x7200

_start:
    jmp main

hw:
    db "Hello, world!", 0x0d, 0x0a, 0

main:
    xor bx, bx
    mov si, hw
printloop:
    mov al, cs:[si]
    test al, al
    jz  done
    mov ah, 0x0e
    int 0x10
    inc si
    jmp printloop

done:
    retf