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Microprocessor

Microprocessor
A combinational PLD with a programmable AND array and a fixed OR array is called a

 PROM
 PLD
 PAL
 PLA

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Microprocessor
A sequence of two registers that multiplies the content of DE register pair by two and stores the result in HL register pair (in 8085 assembly language) is

 XTHL & DAD H
 XCHG & DAD B
 PCHL & DAD D
 XCHG & DAD H

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Microprocessor
A mask programmed ROM is

 programmed at the time of fabrication
 programmed by the user
 erasable electrically
 erasable and programmable

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Microprocessor
How many 16-bit special purpose registers are present in 8085 microprocessor?

 6
 16
 2
 8

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Microprocessor
The content of the A15-A8 (higher order address lines) while executing “IN 8-bit port address” instruction are

 all bits set (i.e. FFH)
 all bits reset (i.e. 00H)
 irrelevant
 same as the content of A7-A0

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Microprocessor
Identify the programmable DMA controller from the following

 8279
 8253
 8257
 8251

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