code: def push(cpu, value, size):
          
          assert size in (8, 16, cpu.address_bit_size)
          cpu.STACK = cpu.STACK - size // 8
          base, _, _ = cpu.get_descriptor(cpu.read_register('SS'))
          address = cpu.STACK + base
          cpu.write_int(address, value, size)
docs: Writes a value in the stack.
  
          :param value: the value to put in the stack.
          :param size: the size of the value.