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Microprocessor

Microprocessor
What is the size (in bytes) of Prefetch queue in 8086?

 4.
 3.
 6.
 2.

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Microprocessor
Consider the following I) Sign flag II) Trap flag III) Parity flag IV) Auxiliary carry flag. Which one of the above flags is/are present in 8085 microprocessor?

 (I) & (II)
 (I) ,(III) & (IV)
 (I) only
 (II) & (III)

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Microprocessor
The timing difference between a slow memory and fast processor can be resolved if

Neither A nor B
Either A or B
External buffer is used
Processor is capable of waiting

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Microprocessor
Which one of the following ICs is used to interface keyboard and display?

 8259
 8251
 8279
 8253

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Microprocessor
Inintel 8085A microprocessor ALE signal is made high to

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

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Microprocessor
The 8085 microprocessor uses a crystal of frequency 6.25 Mhz. The T-state value is

 320ns
 1280ns
 960ns
 640ns

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