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Microprocessor

Microprocessor
Identify the communication interfacing device from the following

 8257
 8155
 8251
 8255

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Microprocessor
Bus Interface Unit (BIU) in 8086 performs the following functions:

 Instruction fetch.
 All the above.
 Instruction decoding.
 Arithmatic and Logic operations.

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Microprocessor
Total numbers of output pins in 8085 microprocessor are

 40
 27
 30
 13

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Microprocessor
Which of the following instruction will never affect the zero flag?

 ORA R
 XRA R
 DCX Rp
 DCR R

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Microprocessor
In a microcomputer , the address of memory locations are binary numbers that identify each memory circuit where a byte is stored. If a microcomputer uses 20-bit address, then numbers of different memory locations are

 220 - 1
 220
 220-1
 20

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Microprocessor
In 8086 the number of bytes which can be addressed directly is about

10000
one million
100000
1000

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