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Microprocessor

Microprocessor
DMA signal/signals in 8085 is/are

 READY.
 All.
 HLDA.
 HOLD.

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Microprocessor
Which of the following is a valid integer constant?

127
125 + 3
127
127

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Microprocessor
Let the content of register C be 00000000 before the instruction DCR C is executed. The content of register C after the after the execution of this instruction will be

 00000000
 None
 00000001
 11111111

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Microprocessor
How many bytes in a zero memory page should be reserved for vectors used by RST instructions?

 16.
 128.
 32.
 64.

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Microprocessor
Maximum of how many devices can be connected simultaneously to the microprocessor via 8257 in DMA data transfer mode?

 6
 8
 4
 10

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

 SUB A
 CLR A
 ORA A
 MOV A, 00H

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