rdos/com/hello.asm

org 0x0100

main:
  mov si, hello
.loop:
  lodsb
  test al, al
  jz .ret
  mov dl, al
  mov cl, 0x02
  call 5
  jmp .loop
.ret:
  ret

hello:
  db "Hello!", 0x0A, 0x0D, 0