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Microprocessor

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

 PAL
 PLD
 PROM
 PLA

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Microprocessor
Which one of the following ICs is used to interface keyboard and display?

 8279
 8253
 8251
 8259

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Microprocessor
SUB A instruction in 8085

 sets zero and carry flags
 sets zero and sign flags
 reset zero and parity flags
 reset carry and sign flags

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Microprocessor
Assertion(A): Address bus is unidirectional. Reason(R): Data bus is bidirectional

 Both A & R are true but R is not the correct explanation of A
 A is false but R is true
 Both A & R are true and R is the correct explanation of A
 A is true but R is false

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Microprocessor
Total number of instructions in 8085 microprocessor assembly language is

 247
 246
 244
 245

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Microprocessor
Identify the communication interfacing device from the following

 8155
 8251
 8257
 8255

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