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Microprocessor

Microprocessor
Maximum number of I/O that can be addressed by the INTEL 8085 is

 65536
 512
 256
 285

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Microprocessor
Which one of the following instruction may be used to clear the accumulator content irrespective of its initial value?

 ORA A
 CLR A
 SUB A
 MOV A, 00H

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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?

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

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Microprocessor
The first machine cycle of an instruction is always

 An I/O read cycle
 A fetch cycle
 A memory write cycle
 A memory read cycle

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Microprocessor
A bus connected between the CPU and main memory that permits transfer of information between main memory and the CPU is known as

 Address bus
 Control bus
 DMA bus
 Memory bus

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Microprocessor
Total number of modes the 8253 can work

 6
 4
 8
 12

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