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Microprocessor

Microprocessor
Which one of the following ICs is used to interface keyboard and display?

 8251
 8253
 8279
 8259

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Microprocessor
The multiplexing of address bus and data buses is used in

 all the microprocessors.
 never multiplexed.
 none of these.
 depends on the internal architecture.

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Microprocessor
Each instruction in assembly language program has the following fields:Lable fieldMnemonic fieldOperand fieldComment fieldThe correct sequence of these fields is?

2, 1, 3, 4
1, 2, 4, 3
1, 2, 3, 4
2, 1, 4, 3

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Microprocessor
The program counter in a 8085 micro-processor is a 16-bit register, because

 It counts 16-bits at a time
 There are 16 address lines
 It has to fetch two 8-bit data at a time
 It facilitates the user storing 16-bit data temporarily

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Microprocessor
Consider the following registers: 1. Accumulator and flag register 2. B and C register 3. D and E register 4. H and L register Which of these 8-bit registers of 8085 microprocessor can be paired together to make a 16-bit register?

 1, 2 and 3
 1, 2 and 4
 1, 3 and 4
 2, 3 and 4

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Microprocessor
A 37 bit mantissa has an accuracy of

11 decimal places
6 decimal places
10 decimal places
8 decimal places

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