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Microprocessor

Microprocessor
Which one of the following circuits transmits two messages simultaneously in one direction

 Diplex
 Duplex
 Simplex
 Quadruplex

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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

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

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Microprocessor
Which of the following is not treated as hexadecimal constant by assembler in 8085?

6 AFH
45 H
234
64 H

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Microprocessor
Consider the following registers: 1. Accumulator and flag register 2. B and C register 3. D and E register 4. H and L register Which of these 8-bit registers of 8085 microprocessor can be paired together to make a 16-bit register?

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

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Microprocessor
An I/O processor controls the flow of information between

Two I/O devices
Cache and main memory
Cache memory and I/O devices
Main memory and I/O devices

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

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