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Microprocessor

Microprocessor
The five flags in 8085 are designated as

Z, CY, S, P and AC
D, Z, S, P, AC
Z, CY, S, D, AC
Z, C, S, P, AC

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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?

 1, 3, 4
 2, 3, 5
 1, 2, 5
 1, 3, 5

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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

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

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

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

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Microprocessor
A number of 1-bit registers used in microprocessors to indicate certain conditions are usually referred to as

 flags
 latches
 shift registers
 counters

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Microprocessor
Identify the non-programmable interfacing device from the following

 8212.
 8295.
 8257.
 8255.

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