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Microprocessor

Microprocessor
Using DeMorgan’s Theorem we can convert any AND-OR structure into

OR-NAND
NAND-NAND
NOR-NAND
NAND-NOR

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Microprocessor
The data bus of any microprocessor is always

 Unidirectional
 Either unidirectional or bi-directional
 Bi-directional
 None

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Microprocessor
Identify the programmable DMA controller from the following

 8253
 8257
 8251
 8279

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Microprocessor
Which one of the following instruction may be used to clear the accumulator content irrespective of its initial value?

 SUB A
 MOV A, 00H
 ORA A
 CLR A

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Microprocessor
The stack pointer

 resides in ROM
 may be in RAM or ROM
 resides in microprocessor
 resides in RAM

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Microprocessor
The frequency of the driving network connected between pins 1 and 2 of 8085 microprocessor is

 equal to the desired frequency
 twice the desired frequency
 four times the desired frequency
None of these

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