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Microprocessor

Microprocessor
Using one 8259 IC is equivalent to providing …………. INTR pins on 8085

 18
 8
 16
 12

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Microprocessor
In microprocessor based system DMA refers to

 direct memory access for the user
 direct memory access for microprocessor
 direct memory access for the I/O device
None of these

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Microprocessor
In microprocessor based system I/O ports are used to interface

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

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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
In a microprocessor based system the stack is always in

 microprocessor
 ROM
 EPROM
 RAM

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Microprocessor
________used to implement the hardware interrupts (RST 7.5, RST 6.5, RST 5.5) by setting various bits to form masks or generate output data via the Serial Output Data (SOD) line.

 EI
 DI
 SIM
 RIM

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