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Microprocessor

Microprocessor
Using one 8259 IC is equivalent to providing …………. INTR pins on 8085

 8
 18
 12
 16

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Microprocessor
In one’s complement 8 bit representation 11111111 represents

-0
1
+0
-1

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Microprocessor
The microprocessor issues ALE during first T-state of

 memory WRITE cycle only
 fetch cycle only
 memory READ cycle only
 every machine cycle

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Microprocessor
Identify the non-programmable interfacing device from the following

 8255.
 8295.
 8257.
 8212.

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Microprocessor
Which of the following conditions is not allowed in an RS latch?

R is asserted, S is asserted
R is asserted, S is negated
R is negated, S is asserted
R is negated, S is negated

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

 4
 6
 10
 8

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