code: function sla (cpu, n) {
      const r = n << 1;
  
      cpu.f = 0;
      if ((r & 0xff) == 0) cpu.f |= FLAG_Z;
      if ((n & 0x80) != 0) cpu.f |= FLAG_C;
  
      return r;
  }
docs: SLA n
  
  Description:
  Shift n left into Carry. LSB of n set to 0.
  
  Use with:
  n = A, B, C, D, E, H, L, (HL)
  
  Flags affected:
  Z - Set if result is zero.
  N - Reset.
  H - Reset.
  C - Contains old bit 7 data.
  
  Opcodes:
  Instruction    Parameters    Opcode    Cycles
  SLA            A             CB 27     8
  SLA            B             CB 20     8
  SLA            C             CB 21     8
  SLA            D             CB 22     8
  SLA            E             CB 23     8
  SLA            H             CB 24     8
  SLA            L             CB 25     8
  SLA            (HL)          CB 26     16