8 Which of the following is a RISC architecture a 80286 b MIPS c Zilog Z80 d

8. Which of the following is a RISC architecture?a) 80286b) MIPSc) Zilog Z80d) 80386View AnswerAnswer: bExplanation: MIPS possess a RISC architecture whereas 80386, 80286 and Zilog Z80are CISC architectures.9. Which one of the following is board based system?a) Data busb) Address busc) VMEbusd) DMA busView AnswerAnswer: cExplanation: VMEbus is Versa Module Europa Bus which is used as a board basedsystem for easy manipulation. VMEbus is a computer bus standard developed for theMotorola MC6800 family and is mainly based on Eurocard sizes.10. VME bus stands fora) Versa module Europa busb) Versa module embedded busc) Vertical module embedded busd) Vertical module Europa busView AnswerAnswer: aExplanation: A computer bus standard in Eurocard sizes mainly developed for MotorolaMC6800 family and later on used in many applications and approved by IEEE.

1. Which of the following microprocessor is designed by Zilog?a) Z80b) Zigbeec) 80386d) 8087View AnswerAnswer: aExplanation: Designed by Zilog in 1976. 80386 and 8087 are the processors designedby Intel and Zigbee is IEEE based which is used for high-level communication protocol.2. Z80 is mainly based ona) Intel 8080b) MIPSc) TIMSd) 8051View Answer3. Flag register of Z80 is also known asa) Program status registerb) Program status addressc) Program status wordd) Program address registerView AnswerAnswer: cExplanation: The flag register of Z80 contains status information such as carry, overflow,signed etc.4. What are the two register sets used in Z80?a) C’D’ and BC’b) CD and BDc) IV and MRd) Main and alternateView AnswerAnswer: dExplanation: Z80 have two sets of registers which are the main registers and alternateregisters.

5. How an alternate set of the register can be identified in Z80?a) ‘Suffixb) ‘Prefixc) ,suffixd) ,prefixView AnswerAnswer: aExplanation: In order to identify the main register and alternate register ‘ is used in thesuffix.6. What is the purpose of memory refresh register of Z80?a) To control on-chip DRAMb) To control on-chip SRAMc) To control ROMd) To clear cacheView AnswerAnswer: aExplanation: In addition to the general purpose registers, a stack pointer, programcounter, and two index registers are included in Z80. It was also used in manyembedded designs because of its high-quality performance and for its in-built refreshcircuitry for DRAMs.7. What is the clock frequency of Z80?a) 6 MHzb) 8 MHzc) 4 MHzd) 2 MHzView AnswerAnswer: cExplanation: It is the maximum clock frequency or runs a time of the processor.8. Which are the two additional registers of Z80?a) Interrupt and NMIb) NMI and PSWc) Interrupt vector and memory refreshd) NMI and memory refreshView Answer

Answer: cExplanation: The Interrupt vector(IV) register is used in the interrupt handling. Mode 2 isused to point the required software routine to process the interrupt. In mode 1, theinterrupt vector is supplied via the external data bus.

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