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Microprocessor

Microprocessor
How many machine cycles are required for execution of IN 30H instruction

 3
 5
 4
 6

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Microprocessor
The control flags in 8086 are:

 the Trap flag(TF).
 the direction flag(DF).
All of these
 the interrupt flag(IF).

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Microprocessor
Identify the programmable interval timer from the following

 8253
 8275
 8279
 8252

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Microprocessor
In microprocessor based system DMA refers to

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

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Microprocessor
Which one of the following statement is false?

 A microprocessor has bi-directional data bus
 A microprocessor has bi-directional address bus
 A microprocessor has an ALU
 A microprocessor has unidirectional address bus

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Microprocessor
Maximum of how many devices can be connected simultaneously to the microprocessor via 8257 in DMA data transfer mode?

 6
 10
 8
 4

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