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Microprocessor

Microprocessor
Which of the following is a valid integer constant?

127
127
125 + 3
127

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

 8253
 8279
 8251
 8259

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Microprocessor
The characteristics of RESET OUT signal is/are

 this signal can be used to reset other devices.
 all.
 indicates that µp is being reset.
 the signal is synchronized to the processor clock.

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Microprocessor
Temporary registers in 8085 are

 B and C.
 W and Z.
 H and L.
 D and E.

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Microprocessor
I)A total of about one million bytes can be directly addressed by the 8086 microprocessor II)8086 has thirteen 16-bit registers III)8086 has eight flags IV)Compared to 8086, the 80286 provides a higher degree of memory protection Which one of the statements given above are correct?

 1,3 &4
 1,2 & 3
 2,3&4
 1,2 & 4

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Microprocessor
What is mean by ALU

 Arithmetic logic unsigned
 Arithmetic local unsigned
 Arithmetic logic unit
 Arithmetic logic upgrade

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