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Microprocessor

Microprocessor
In order to save accumulator value on the stack, which of the following instruction may be used

 PUSH A
 PUSH SP
 PUSH PSW
 POP PSW

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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 microprocessor based system I/O ports are used to interface

 the O/P devices only
 all the I/O devices
 the I/P device only
 the I/O devices and memory chips

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Microprocessor
What is used to access 16-bit data in 8086?

 Memory Banking.
 Pipeline architecture.
 Data Banking.
None of these

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

 ORI 0FH
 ANI 0FH
 XRI 0FH
 CMA

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Microprocessor
Identify the communication interfacing device from the following

 8255
 8251
 8155
 8257

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