code: def _not16(ins):
      ''' Negates top (Logical NOT) of the stack (16 bits in HL)
      '''
      output = _16bit_oper(ins.quad[2])
      output.append('ld a, h')
      output.append('or l')
      output.append('sub 1')
      output.append('sbc a, a')
      output.append('push af')
      return outpuf _not16(ins):
      ''' Negates top (Logical NOT) of the stack (16 bits in HL)
      '''
      output = _16bit_oper(ins.quad[2])
      output.append('ld a, h')
      output.append('or l')
      output.append('sub 1')
      output.append('sbc a, a')
      output.append('push af')
      return output
docs: Negates top (Logical NOT) of the stack (16 bits in HL)