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Microprocessor

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

 3.
 6.
 2.
 4.

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Microprocessor
CALL instruction is a ______ instruction.

 1 bytes
 4 bytes
 3 bytes
 2 bytes

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Microprocessor
Length of the instruction POP D is

 4 byte
 3 byte
 2 byte
 1 byte

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Microprocessor
In microprocessor based system DMA refers to

None of these
 direct memory access for the user
 direct memory access for microprocessor
 direct memory access for the I/O device

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Microprocessor
While using a frequency counter for measuring frequency, two modes of measurement are possible: Period time Frequency mode There is a ‘cross-over frequency’ below which the period mode is preferred. Assuming the crystal oscillator frequency to be 4MHz, the crossover frequency is given by

 2 Khz.
 2 Mhz.
 8 Mhz.
 1Khz.

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Microprocessor
An I/O processor controls the flow of information between

Cache and main memory
Main memory and I/O devices
Two I/O devices
Cache memory and I/O devices

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