code: function srl (cpu, n) {
      const r = n >> 1;
  
      cpu.f = 0;
      if ((r & 0xff) == 0) cpu.f |= FLAG_Z;
      if ((n & 1) != 0) cpu.f |= FLAG_C;
  
      return r;
  }
docs: SRL n
  
  Description
  Shift n right into Carry. MSB 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 0 data.
  
  Opcodes:
  Instruction    Parameters    Opcode    Cycles
  SRL            A             CB 3F     8
  SRL            B             CB 38     8
  SRL            C             CB 39     8
  SRL            D             CB 3A     8
  SRL            E             CB 3B     8
  SRL            H             CB 3C     8
  SRL            L             CB 3D     8
  SRL            (HL)          CB 3E     16