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Q.

The device that enables the microprocessor to read data from the external devices is

A

printer

B

joystick

C

display

D

reader

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1.

The example of output device is

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CRT display

B

7-segment display

C

Printer

D

All of the mentioned

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2.

The operation, IOWR (active low) performs

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write operation on input data

B

write operation on output data

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read operation on input data

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read operation on output data

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What is correct range of frequency for 8257?

A

500Hz to 3MHz.

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250Hz to 2MHz.

C

250Hz to 3MHz.

D

500Hz to 2MHz.

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While performing read operation, one must take care that much current should not be

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sourced from data lines

B

sinked from data lines

C

sourced or sinked from data lines

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sinked from address lines

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5.

In memory-mapped scheme, the devices are viewed as

A

distinct I/O devices

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memory locations

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only input devices

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only output devices

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