Microprocessor

Question 41

What will be the output at PORT1 if the following program is executed ? MVI B, 82H MOV A, B MOV C, A MVI D, 37H OUT PORT1 HLT

• 37H
• 82H
• B9H
• 00H

Question 42

Which of the following 8085 microprocessor hardware interrupt has the lowest priority?

• RST 6.5
• RST 7.5
• TRAP
• INTR

Question 43

What is the meaning of RD\'signal in Intel 8151 A?

• Read (when it is low)
• Read (when it is high)
• Write (when it is low)
• Read and Write (when it is high)

Question 44

Find the memory address of the next instruction executed by the microprocessor (8086), when operated in real mode for CS=1000 and IP=E000

• 10E00
• 1E000
• F000
• 1000E

Question 45

Two control signals in microprocessor which are related to Direct Memory Access (DMA) are

• INTR & INTA
• RD & WR
• S0 & S1
• HOLD & HLDA

Question 46

Which of the following is/are the principle components of a memory-tube display ? (a)Flooding gun (b)Collector (c)Phosphorus grains (d)Ground Codes:

• (a) and (b)
• (c) only
• (d) only
• All the above

Question 47

Which of the following steps is/are not required for analog to digital conversion? (a)Sensing (b)Conversion (c)Amplification (d)Conditioning (e)Quantization Codes:

• (a) and (b)
• (c) and (d)
• (a), (b) and (e)
• None of the above

Question 48

Which of the following is/are the components of a CRT? (a)Electron Gun (b)Control Electrode (c)Focusing Electrode (d)Phosphor Coated Screen Codes:

• (a) and (d)
• (a), (b) and (d)
• (a), (b), (c) and (d)
• (a), (c) and (d)

Question 49

A certain microprocessor requires 4.5 microseconds to respond to an interrupt. Assuming that the three interrupts I1, I2 and I3 require the following execution time after the interrupt is recognized: i. I1 requires 25 microseconds ii. I2 requires 35 microseconds iii. I3 requires 20 microseconds I1 has the highest priority and I3 has the lowest. What is the possible range of time for I3 to be executed assuming that it may or may not occur simultaneously with other interrupts?

• 24.5 microseconds to 39.5 microseconds
• 24.5 microseconds to 93.5 microseconds
• 4.5 microseconds to 24.5 microseconds
• 29.5 microseconds 93.5 microseconds

Question 50

The address space of 8086 CPU is

• one Megabyte
• 256 Kilobytes
• 1 K Megabytes
• 64 Kilobytes