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Microprocessor

Microprocessor
In a microprocessor based system the stack is always in

 ROM
 microprocessor
 RAM
 EPROM

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Microprocessor
How many machine cycles are required for execution of IN 30H instruction

 6
 3
 5
 4

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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?

 1,2 & 4
 2,3&4
 1,3 &4
 1,2 & 3

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Microprocessor
Which one of the following circuits transmits two messages simultaneously in one direction

 Duplex
 Diplex
 Simplex
 Quadruplex

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Microprocessor
The addressing mode in instruction PUSH B is

 immediate
 register indirect
 direct
 register

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Microprocessor
After RESET 8255 will be in

 mode 0; all ports are output
 mode 2
 unchanged condition
 mode 0; all ports are input

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