Which one of the following is used as the interface chip for data transmission between 8086 and a 16-bit ADC?
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Which of the following is a peripheral device
A. 8085
B. 8051
C. 8255
D. None of these
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The principle of locality of reference justifies the use of
A. Interrupts
B. DMA
C. Virtual memory
D. Cache memory
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A 'DMA' transfer implies
A. Direct transfer of data between memory and accumulator
B. Direct transfer of data between memory and I/O devices without the use of µP
C. Transfer of data exclusively within µP registers
D. A fast transfer of data between µP registers
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Which of the following statements with reference to a generic microprocessor is correct?
A. Instruction cycle time period is exactly equal to machine cycle time period
B. Instruction cycle time period is shorter than machine cycle time period
C. Machine cycle time period shorter than instruction cycle time period
D. Instruction cycle time period is exactly half of machine cycle time period
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How does 80386 change operation from real mode to protected mode?
A. By resetting MSB of CR1 contents
B. By setting MSB of CR0 contents
C. By setting MSB of CR1 contents
D. By setting MSB of CR2 contents
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In 8085 RRC stands for:
A. Rotate accumulator right
B. Rotate accumulator right through carry
C. Rotate right carry
D. Rotate right carry through accumulator
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DMA Module can communicate with CPU through:
A. Interrupt
B. Cycle stealing
C. Branch instruction
D. None of these
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How many different locations can be selected by using 16 address lines
A. 1600
B. 3200
C. 65536
D. 67200
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To have the multiprocessing capabilities of 8086 microprocessor, the pin connected to the ground is
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In a daisy chained connection to the CPU, the peripheral whose interrupt request has the highest priority is the one
A. With the largest vector address
B. With highest speed of operation
C. Electrically nearest to the CPU
D. Electrically farthest from the CPU
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Pipelining technique is used in microprocessor to improve which of the following parameter?
A. Power dissipation
B. Interrupt latency
C. Die size
D. Maximum clock frequency
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The number of hardware interrupts (which require an external signal to interrupt) present in an 8085 microprocessor are
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A microprocessor perform
A. Low pass filtering
B. Logic operation
C. Amplification
D. None of these
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Consider the following instructions executed in 8086.
PUSH AX; AX has 20 Hex in it
PUSH BX; BX has 34 Hex in it
POP AX;
ADD AX, BX;
POP G
The value stored in G would be
A. 20 Hex
B. 34 Hex
C. 54 Hex
D. 68 Hex
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When the microprocessor receives an interrupt request, it finishes the instruction it is executing and then jumps to:
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In mode 0, Interrupt on terminal count of 8253, if the gate pin is made low while counter is decrementing, which one of the following operations will follow?
A. Counter stops and cleared to '0' and starts decrementing when gate pin is made high
B. Counter stops and thereafter it increments till gate pin = '1' high
C. Counter stops, the current contents are held and the decrement operation resume only after gate pin is made high
D. Counter stops, the current contents are held for one clock cycle and the decrement operation resume
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An 8-bit microcontroller has an external RAM with the memory map from 8000H to 9FFFH. The number of bytes this RAM can store is
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For 8086 microprocessor, the jump distance in bytes for short jump range is
A. Forward 255 and Backward 256
B. Forward 127 and Backward 128
C. Forward 31 and Backward 32
D. Forward 15 and Backward 16
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The instruction DAA in 8085
A. converts binary to BCD
B. converts BCD to binary
C. adds contents of accumulator to accumulator
D. decrements accumulator
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