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Microprocessor

Microprocessor
CALL instruction is a ______ instruction.

 3 bytes
 4 bytes
 1 bytes
 2 bytes

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

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Microprocessor
Identify the communication interfacing device from the following

 8257
 8251
 8255
 8155

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Microprocessor
What is the size (in bytes) of Prefetch queue in 8086?

 4.
 6.
 2.
 3.

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

 8
 16
 12
 18

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Microprocessor
The operating modes of 8255 A are called

Mode 0, mode 1 and mode 2
Mode 0 and mode 1
Mode 0 and mode 2
Mode 0, mode 2 and mode 3

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