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Microprocessor

Microprocessor
8085 microprocessor has how many pins

 39.
  30.
 41.
  40.

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Microprocessor
S0 and S1 pins are used for

 indicating the processor’s status
 serial communication
None of these
 acknowledging the interrupt

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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
 ORA A
 MOV A, 00H
 CLR A

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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
Consider the following statements: Arithmetic Logic Unit (ALU) 1.Performs arithmetic operations 2.Performs comparisons. 3.Communicates with I/O devices 4.Keeps watch on the system Which of these statements are correct?

 1 and 2 only
 3 and 4 only
 1, 2, 3 and 4
 1, 2 and 3

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Microprocessor
Which one of the following microprocessor has 16-bit data bus?

 Z-80
 68000
 8085
 6502

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