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Microprocessor

Microprocessor
DMA is used between

 microprocessor and I/O
 memory and I/O
 none
 microprocessor and memory

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Microprocessor
In a C expression using assignment operators, relational operators and arithmetic operators, the hierarchy of operations (in the absence of parenthesis) is

Relational, assignment, arithmetic
Arithmetic, assignment, relational
Assignment, relational, arithmetic
Arithmetic, relational, assignment

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Microprocessor
Let the content of register C be 00000000 before the instruction DCR C is executed. The content of register C after the after the execution of this instruction will be

 00000000
 None
 00000001
 11111111

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Microprocessor
Assertion(A): Address bus is unidirectional. Reason(R): Data bus is bidirectional

 Both A & R are true and R is the correct explanation of A
 A is true but R is false
 A is false but R is true
 Both A & R are true but R is not the correct explanation of A

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Microprocessor
A sequence of two registers that multiplies the content of DE register pair by two and stores the result in HL register pair (in 8085 assembly language) is

 PCHL & DAD D
 XCHG & DAD H
 XTHL & DAD H
 XCHG & DAD B

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Microprocessor
The timing difference between a slow memory and fast processor can be resolved if

Processor is capable of waiting
Neither A nor B
External buffer is used
Either A or B

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