91. Which of the following make 8155 different from 8255?

1. 1. A timer

   
   
   

   2. 3, 8-bit I/O ports

   
   
   

   3. Dynamic RAM

   
   
   

   4. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   A timer

   Correct Option: A

   A timer

---

92. How many I/O ports of 8 bit each are present in Intel 8155?
    

1. 1. 1

   
   
   

   2. 3

   
   
   

   3. 2

   
   
   

   4. 4

   
   
   

---

1. View Hint View Answer Discuss in Forum

   3

   Correct Option: B

   3

---

---

93. Which of the following can be used as a multipurpose programmable device?

1. 1. Intel 8155

   
   
   

   2. Intel 8255

   
   
   

   3. Intel 8251

   
   
   

   4. Intel 8237

   
   
   

---

1. View Hint View Answer Discuss in Forum

   Intel 8155

   Correct Option: A

   Intel 8155

---

94. To program 8155, port A and port B as output ports, what will be the control word?

1. 1. 03 H

   
   
   

   2. 01 H

   
   
   

   3. 02 H

   
   
   

   4. F 3 H

   
   
   

---

1. View Hint View Answer Discuss in Forum

   03 H

   Correct Option: A

   03 H

---

---

95. A 12 bit D/A converter is calibrated over the range 0 to 10V. Calculate the output, if input is 01H—

1. 1. 2.44 mV

   
   
   

   2. 9 mV

   
   
   

   3. 10 mV

   
   
   

   4. None

   
   
   

---

1. View Hint View Answer Discuss in Forum

   2·44 mV
   I/P =

   O/P =	10	= 2·44 mV.
   	4096

   01 H
   

   Correct Option: A

   2·44 mV
   I/P =

   O/P =	10	= 2·44 mV.
   	4096

   01 H
   

---