Computer Organization Architecture

Cache and main memory I/O interface Machine instructions and addressing modes Registers

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Computer Organization Architecture - Machine instructions and addressing modes

21:

The addressing mode used in the instruction PUSH B is

A.	Direct
B.	Register
C.	Register indirect
D.	Index
	Answer Report Discuss
	Option: B Explanation : Push is used to write into stack 1. This is not direct we are not mentioning address here. 2. It's not register indirect we are not mentioning register which contain address. 3. It's not immediate we are not storing immediate value. So answer is (B) i.e. register addressing Click on Discuss to view users comments. srishti said: (5:34pm on Sunday 5th May 2013) its direct addressing mode not register addressing mode Write your comments here: Updating your Comments.. Updating your Comments..

22: The process of fetching and executing instructions,one at a time, in order of increasing addreses is called

A.	Instruction execution
B.	Straight line sequencing
C.	Instruction fetch
D.	Instruction Cycle
	Answer Report Discuss
	Option: B Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

23: The CPU of a Computer takes instruction from the memory and executes them. This process is called

A.	Load cycle
B.	Time sequence
C.	Fetch-execute cycle
D.	None of these
	Answer Report Discuss
	Option: C Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

24: When a program is being executed in an 8085 microprocessor, its Program Counter contains

A.	Number of instructions in the current program that have already been executed
B.	The total number of instructions in the program being executed
C.	Memory address of the instruction that is being currently executed
D.	Memory address of the instruction that is to be executed next
	Answer Report Discuss
	Option: D Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

25: When the HLT instruction of a 8085 micro-processor is executed, the microprocessor

A.	Is disconnected from the system bus till the reset is pressed
B.	Halts execution of the program and returns to monitor
C.	Enters into a halt state and the buses are tri- stated
D.	Reloads the program form the locations 0012 and 0013 H.
	Answer Report Discuss
	Option: C Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

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