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Microprocessor

Microprocessor
The number of interrupt lines in 8085 is

2
5
3
4

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Microprocessor
Which one of the following ICs is used to interface keyboard and display?

 8259
 8279
 8253
 8251

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Microprocessor
At the beginning of a fetch cycle, the contents of the program counter are

 transferred to memory data register.
 incremented by one.
 transferred to address bus.
 transferred to memory address register .

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Microprocessor
In 8085 name/names of the 16 bit registers is/are

 both A and B.
 none of these.
 stack pointer.
 program counter.

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Microprocessor
In one’s complement 8 bit representation 11111111 represents

+0
-0
1
-1

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Microprocessor
The instruction set of a microprocessor

 is specified by the user
 is specified by the manufacturers
 cannot be changed by the user
 is stored inside the microprocessor

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