Microprocessors - ECE Questions and Answers

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In 8085, F register has 8 bits.

True

False

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The general purpose register code for accumulator in 8085 is

111

000

001

1111

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Which of the following is not an internal DOS command?

VER

COPY

MEM

DATE

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In 8085, high level on INTR line can be recognised only if

TRAP and RST lines are high

TRAP and RST lines are not high

TRAP line is high but not RST line

RST line is high but not TRAP line

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The word size accessible at a time from the memory subsystem depends on

width of data bus

width of address bus

width of control bus

both (b) and (c)

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In windows the middle button of mouse is not used.

True

False

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Microprocessor 8088 has

16 bit registers and 16 bit data bus

8 bit registers and 8 bit data bus

8 bit registers and 16 bit data bus

16 bit registers and 8 bit data bus

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Assertion (A): In 8085, P flag is for parity checking.

Reason (R): If the result of ALU has even parity, P flag is set and if the result has odd parity, P flag is reset.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct R is wrong

A is wrong R is correct

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Which of the following is not a special purpose peripheral?

Programmable DMA controller

Programmable Floppy disc controller

Programmable Hard disc controller

Programmable CRT controller