Read Keyboard, boot sector program

[bits 16]
[org 0x7c00]

  cli
  xor ax, ax
  mov ds, ax
  mov es, ax
  mov ss, ax
  mov sp, 0x7c00
  sti

start:
  mov ah, 0x00
  int 0x16

  cmp al, 0x1b
  je  stop

  mov ah, 0x0e
  int 0x10
  jmp start

stop:
    hlt
times 510-($-$$) db 0
dw 0xAA55