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Microprocessor

Microprocessor
Which one of the following microprocessor has 16-bit data bus?

 8085
 6502
 Z-80
 68000

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Microprocessor
While using a frequency counter for measuring frequency, two modes of measurement are possible: Period time Frequency mode There is a ‘cross-over frequency’ below which the period mode is preferred. Assuming the crystal oscillator frequency to be 4MHz, the crossover frequency is given by

 1Khz.
 8 Mhz.
 2 Khz.
 2 Mhz.

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Microprocessor
Using DeMorgan’s Theorem we can convert any AND-OR structure into

NAND-NAND
OR-NAND
NOR-NAND
NAND-NOR

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Microprocessor
SUB A instruction in 8085

 reset zero and parity flags
 sets zero and carry flags
 sets zero and sign flags
 reset carry and sign flags

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Microprocessor
The multiplexing of address bus and data buses is used in

 all the microprocessors.
 never multiplexed.
 depends on the internal architecture.
 none of these.

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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 write cycle
 A memory read cycle

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