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Microprocessor

Microprocessor
How many machine cycles are required for execution of IN 30H instruction

 5
 4
 6
 3

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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 B
 XTHL & DAD H
 XCHG & DAD H

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Microprocessor
While INX B instruction execute,

 only carry flag will be affected
 no flags will be affected
 only carry and zero flags will be affected
 all flags will be affected

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

 RST 6.5
 RST 5.5
 TRAP
 both ‘a’ and ‘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
External buffer is used
Either A or B
Neither A nor B

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Microprocessor
In a microcomputer , the address of memory locations are binary numbers that identify each memory circuit where a byte is stored. If a microcomputer uses 20-bit address, then numbers of different memory locations are

 20
 220
 220-1
 220 - 1

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