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Microprocessor

Microprocessor
Which of the following instruction will never affect the zero flag?

 DCX Rp
 DCR R
 ORA R
 XRA R

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Microprocessor
The program counter in a 8085 micro-processor is a 16-bit register, because

 It facilitates the user storing 16-bit data temporarily
 It counts 16-bits at a time
 There are 16 address lines
 It has to fetch two 8-bit data at a time

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Microprocessor
Which memory has read operation, byte erase, byte write and chip erase?

EEPROM
RAM
Both B and C
UVEPROM

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Microprocessor
In 8085 microprocessor, the RST6 instruction transfer programme execution to following location

 0030H.
 0024H.
 0048H.
 0060H.

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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
 10
 8
 4

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Microprocessor
In a microprocessor based system the stack is always in

 microprocessor
 RAM
 EPROM
 ROM

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