public CU(RegisterMemory registerMemory, ALU alu)
 {
     this.registerMemory = registerMemory;
     this.alu            = alu;
 }
 public ALU(RegisterMemory registerMemory)
 {
     this.registerMemory = registerMemory;
 }
 public OS(CU cu, RegisterMemory regMem)
 {
     this.cu             = cu;
     this.registerMemory = regMem;
 }