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Microprocessor

Microprocessor
DMA is used between

 microprocessor and I/O
 memory and I/O
 microprocessor and memory
 none

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Microprocessor
Bus Interface Unit (BIU) in 8086 performs the following functions:

 Instruction decoding.
 Instruction fetch.
 All the above.
 Arithmatic and Logic operations.

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Microprocessor
Inintel 8085A microprocessor ALE signal is made high to

 To disable data bus
 To achieve all the functions listed above
 Enable the data bus to be used as low order address bus
 To latch data D0-D7 from data bus

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Microprocessor
In an intel 8085A, which is the first machine cycle of an instruction?

 A memory write cycle
 An op-code fetch cycle
 A memory read cycle
 An I/O read cycle

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Microprocessor
RST 3 instruction will cause the processor to branch to the location

 0000H
 0024H
 0018H
 0028H

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Microprocessor
The data bus of any microprocessor is always

 None
 Either unidirectional or bi-directional
 Bi-directional
 Unidirectional

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