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Q.

In which mode, the CPU periodically reads an internal flag of 8279 to check whether any key is pressed or not with key pressure?

A

Interrupt mode

B

Polled mode

C

Decoded Mode

D

Encoded Mode

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1.

To avoid loading during read operation, the device used is

A

latch

B

flipflop

C

buffer

D

tristate buffer

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2.

Which mode allows 8/16 character multiplexed displays to be organized as dual 4-bit/single 8-bit display units?

A

Display Entry

B

Display Scan

C

Strobed Input

D

Scanned Keyboard Mode

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3.

Which of the following is not true features of 8257?

A

It has three channels which can be used over three I/O devices.

B

Each channel has 16-bit address and 14-bit counter.

C

Each channel can transfer data up to 64kb.

D

Each channel can be programmed independently.

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4.

Which of the following are known as Higher Address Bus?

A

A15 - A8

B

AD7 - AD0

C

READY

D

WR

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5.

In memory-mapped scheme, the devices are viewed as

A

distinct I/O devices

B

memory locations

C

only input devices

D

only output devices

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