code: function (cpu, mmu, cc) {
      if (cc) {
          mmu.writeWord(cpu.sp -= 2, cpu.pc + 3);
          cpu.pc = mmu.readWord(cpu.pc + 1);
  
          return 24;
      }
      cpu.pc += 3;
  
      return 12;
  }
docs: CALL cc,nn
  
  Description:
  Call address n if following condition is true:
  cc = NZ, Call if Z flag is reset.
  cc = Z, Call if Z flag is set.
  cc = NC, Call if C flag is reset.
  cc = C, Call if C flag is set.
  
  Use with:
  nn = two byte immediate value. (LS byte first.)
  
  Opcodes:
  Instruction    Parameters    Opcode    Cycles
  CALL           NZ,nn         C4        12
  CALL           Z,nn          CC        12
  CALL           NC,nn         D4        12
  CALL           C,nn          DC        12