Why are there two different registers (MAR and MDR) associated with memory? What are the equivalents in the Little Man Computer?

 

ITEC625 MIDTERM EXAMNAME:_____________________________I. For each statement below, Explain Whyit is True or False (2 points each, 10 total)1)Program executon consisTs of repeatng The process of insTructon feTch and insTructonexecuton.2)One drawback of sign-and-magniTude represenTaton is ThaT There are Two represenTatonsof 0.3)BoTh sign-and-magniTude represenTaton and Twos complemenT represenTaton use ThemosT signiFcanT biT as a sign biT.4)Additon and subTracton can be performed on numbers in Two’s complemenT noTaton byTreatng Them as unsigned inTegers.5)Over±ow only happens in additon operaton of Two large numbers.II. Multiple Choices – Choose ONLY 1 Answer (2 points each, 20 points total)1.Which of the following sentences about 8-bit two’s complement is correct?A.The most significant bit has a weight of −26B.The representation range is −128 to +127C.The representation n range is −127 to +128D.To calculate −x from x, we flip all the bits and subtract 12.The processing required for a single instruc±on is called a(n) __________ cycle.A.instructionB.fetchC.executeD.packet3.In ________ representa±on the rule for forming the nega±on of an integer is to invertthe sign bit.A.two’s complementB.sign-and-magnitudeC.biasedD.one’s complement4.________ is when the result may be larger than can be held in the word size beingused.A.UnderflowB.Arithmetic shiftC.OverflowD.Partial product5.Posi±ve numbers less than 2-183(i.e. 10-55in the book) could cause ________.A.negative underflowB.negative overflowC.positive underflowD.positive overflow6.During the _________ the Li²le Man goes to the mailbox address speciFed in theinstruc±on he previously fetched.A.execute portionB.fetch portionC.instruction cycleD.clock cycle7.The __________ interprets the instruc±ons in memory and causes them to beexecuted.A.main memoryB.I/OComputer Systems ArchitectureOct 15, 2016

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