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Microprocessor

Microprocessor
The address bus width of a microprocessor which is capable of addressing 64 Kbytes of the memory is

 20
 8
 16
 12

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Microprocessor
The five flags in 8085 are designated as

D, Z, S, P, AC
Z, C, S, P, AC
Z, CY, S, P and AC
Z, CY, S, D, AC

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

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

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Microprocessor
Inintel 8085A microprocessor ALE signal is made high to

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

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Microprocessor
A mask programmed ROM is

 erasable and programmable
 programmed by the user
 erasable electrically
 programmed at the time of fabrication

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Microprocessor
The cycle required to fetch and execute an instruction in a 8085 microprocessor is which one of the following?

 Instruction cycle
 Memory cycle
 Clock cycle
 Machine cycle

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