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Microprocessor

Microprocessor
RST 3 instruction will cause the processor to branch to the location

 0018H
 0028H
 0024H
 0000H

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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

 11000100
 00000100
 01000000
 010001000

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Microprocessor
In an intel 8085A, which is the first machine cycle of an instruction?

 An op-code fetch cycle
 A memory read cycle
 A memory write cycle
 An I/O read cycle

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Microprocessor
Which one of the following interrupt/interrupts is/are only level triggering?

 RST 6.5
 RST 5.5
 both ‘a’ and ‘b’
 TRAP

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Microprocessor
Bus Interface Unit (BIU) in 8086 performs the following functions:

 Instruction decoding.
 Instruction fetch.
 All the above.
 Arithmatic and Logic operations.

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Microprocessor
Pick up the programmable interrupt controller from the following

 8275
 8279
 8259
 8257

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