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Microprocessor

Microprocessor
The number of status flags present in 8085 microprocessor are

 8
 10
 5
 16

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Microprocessor
The instruction set of a microprocessor

 is specified by the user
 cannot be changed by the user
 is specified by the manufacturers
 is stored inside the microprocessor

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Microprocessor
Assuming LSB is at position 0 and MSB at position 7, which bit positions are not used (Undefined) in flag register of an 8085 microprocessor?

 2, 3, 5
 1, 2, 5
 1, 3, 5
 1, 3, 4

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Microprocessor
In order to complement the lower nibble of accumulator one can use

 CMA
 XRI 0FH
 ORI 0FH
 ANI 0FH

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Microprocessor
The microprocessor issues ALE during first T-state of

 fetch cycle only
 memory WRITE cycle only
 every machine cycle
 memory READ cycle only

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Microprocessor
Which one of the following ICs is used to interface keyboard and display?

 8251
 8253
 8259
 8279

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