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Microprocessor

Microprocessor
In one’s complement 8 bit representation 11111111 represents

1
+0
-0
-1

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Microprocessor
In an 8085 microprocessor based system, the contents of SP are 1000H, PUSH B instruction will transfer the contents of registers B & C respectively for memory locations

 0FFE H and 0FFF H
 1000 H and 0FFF H
 1000 H and 1001 H
 0FFF H and 0FFE H

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Microprocessor
XCHG instruction exchanges the content of H-L with ______ register pair.

 Stack Pointer
 B-C
 D-E
 PSW

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Microprocessor
Identify the programmable DMA controller from the following

 8253
 8257
 8251
 8279

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Microprocessor
SPHL instruction copies the content of H-L register pair to the _________.

 D-E
 Stack Pointer
 B-C
 PSW

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Microprocessor
In Fortran 77 a variable name can contain special characters.

True
False

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