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Microprocessor

Microprocessor
Which one of the following circuits transmits two messages simultaneously in one direction

 Duplex
 Diplex
 Quadruplex
 Simplex

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Microprocessor
How many bytes in a zero memory page should be reserved for vectors used by RST instructions?

 32.
 128.
 16.
 64.

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Microprocessor
Identify the programmable DMA controller from the following

 8257
 8251
 8279
 8253

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Microprocessor
The first machine cycle of an instruction is always

 A memory write cycle
 An I/O read cycle
 A memory read cycle
 A fetch cycle

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Microprocessor
In 8085, the pins for SID and SOD are

3 and 4 respectively
5 and 4 respectively
4 and 3 respectively
4 and 5 respectively

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

 PLA
 PROM
 PLD
 PAL

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