Question # 1

Which is widely used in interrupt controller with a number of microprocessor.

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8251

8254

8255

8259

The external device is connected to a pin called the_____ pin on the processor chip

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Interrupt

Tranasfer

Both a and b

None

Which are used for port A in 8255 mode 1.

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PC0-PC2

PC3-PC7

PC6-PC7

PC3-PC5

Which bus plays a crucial role in I/O

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System bus

Control bus

address bus

Both a and b

The physical address of memory is.

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20 bit

16 bit

32 bit

64 bit

What is the store by register.

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Data

Operands

Memory

None

Which is responsible for all the outside world communication by the microprocessor.

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BIU

PIU

TIU

LIU

Using 12 binary digits how many queue house addresses would be possible.

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2⁸= 256

2¹² = 4096

2¹⁶ = 65536

None

DS stand for

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Data segment

Direct segment

Declare segment

Divide segment

How bit microprocessor inexpensive a separate interface is provided with I/O device.

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2 bit

4 bit

8 bit

32 bit

Name of typical dedicated regtister.

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PC

IR

SP

All these

A fourth bit called the

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Direct bit

Cache bit

Valid bit

All of these

Inc case of direct mapped cache lower order line address bits are used the access the

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RAM

ROM

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1979-1981

1979-1980

1978-1979

1978-1986

The DMA controllers are specials hardware embedded into the chip in modern integrate processor that ____________ and _________ to the system.

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Data transfer

Arbitrate access

Both a and b

None

Which memory read or I/O read are active data is to the procesor.

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Input

Out put

Processor

None

How are the successful microprocessor.

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8004

4004

5006

All of these

Which register is connected to the memory by way of the address bus.

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MAR

MDR

SAM

None

Which mode is used for single handshake in 8255

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Mode 0

Mode 1

Mode 2

None

HLDA stand for

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High acknowledgment

Hold acknowledgement

High access

Hold access

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