Answer by Shift_Left for Printing a string in NASM Win16 Assembly

You have all the elements. The only thing that can be eliminated is jmp .run, as follows:

org 0x100        mov     si, Prompt        call    puts        ret  puts: mov     ah, 0xe        mov     bx, 7 .read: lodsb        or       al, al        jnz     .post             ret .post: int     0x10        jmp     .read Prompt: db  'Hello World', 0

As INT 10H does not trash AH or BX, there is no need to reinitialize them each time through the loop.