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Microprocessor

Microprocessor
Identify the communication interfacing device from the following

 8155
 8257
 8255
 8251

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Microprocessor
The stack pointer

 resides in RAM
 may be in RAM or ROM
 resides in ROM
 resides in microprocessor

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Microprocessor
Pick out the matching pair

 S0;S1;wait status
 READY; RIM
 SID; SIM
 HOLD; DMA

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Microprocessor
How many machine cycles are required for execution of IN 30H instruction

 4
 3
 5
 6

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Microprocessor
A single instruction to clear the lower nibble of accumulator in 8085 language assembly is

 XRI FOH
 XRI 0FH
 ANI F0H
 ANI OFH

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Microprocessor
The word size of 8085 microprocessor is

 4-bit
 8-bit
 20-bit
 16-bit

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