code: def LSL(self, a):
          
          r = a << 1
          self.clear_NZVC()
          self.update_NZVC_8(a, a, r)
          return r
docs: Shifts all bits of accumulator A or B or memory location M one place to
          the left. Bit zero is loaded with a zero. Bit seven of accumulator A or
          B or memory location M is shifted into the C (carry) bit.
  
          This is a duplicate assembly-language mnemonic for the single machine
          instruction ASL.
  
          source code forms: LSL Q; LSLA; LSLB
  
          CC bits "HNZVC": naaas