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Microprocessor

Microprocessor
Which of the following instruction will never affect the zero flag?

 ORA R
 DCX Rp
 XRA R
 DCR R

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Microprocessor
Let the content of accumulator and register B be 0000 0100 and 0100 0000 respectively before execution of instruction SUB B. The content of accumulator after the execution of this instruction will be

 00000100
 010001000
 01000000
 11000100

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Microprocessor
Number of Hex digits needed to represent the 20-bit address of a memory location are

 16
 20
 4
 5

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Microprocessor
In microprocessor based system I/O ports are used to interface

 the I/O devices and memory chips
 the O/P devices only
 the I/P device only
 all the I/O devices

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Microprocessor
Which of the following is not a general purpose peripheral?

Programmable interrupt controller
I/O port
Programmable interval timer
Programmable CRT controller

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

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

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