Peripheral Interface
1.

The ______ is a general purpose programmable I/O device designed to transfer the data from I/O to interrupt I/O.
A.  

8285A

 B.  

8241A

 C.  

8255A

 D.  

8251A
2.

How many ports 8255A has?
A.  

2

 B.  

3

 C.  

4

 D.  

5
3.

 Which port can be split into two parts?
A.  

PORT A

 B.  

PORT B

 C.  

PORT C

 D.  

PORT D
4.

Which of the following are Features of 8255A?
A.  

It consists of 3 8-bit IO ports i.e. PA, PB, and PC.

 B.  

Address/data bus must be externally demux'd.

 C.  

It is TTL compatible.

 D.  

All of the above
5.

Which of the following is responsible for controlling the internal/external transfer of data/control/status word?
A.  

Data Bus Buffer

 B.  

Read/Write Control Logic

 C.  

CS

 D.  

WR
6.

Which of the following uses N-MOS technology?
A.  

8253

 B.  

8254

 C.  

8255

 D.  

8256
7.

It is a tri-state, bi-directional, 8-bit buffer, which is used to interface the 8253/54 to the system data bus.
A.  

Read/Write Logic

 B.  

Data Bus Buffer

 C.  

system data bus

 D.  

System Buffer
8.

 8253/54 can be operated in _________ Modes?
A.  

3

 B.  

4

 C.  

5

 D.  

6
9.

Which mode can be used as a mono stable multi-vibrator?
A.  

Mode 0

 B.  

Mode 1

 C.  

Mode 2

 D.  

Mode 3
10.

Which mode generates a strobe in response to an externally generated signal?
A.  

Mode 3

 B.  

Mode 4

 C.  

Mode 5

 D.  

Mode 6