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Microprocessor

Microprocessor
Which of the following instruction is not possible in 8085?

 POP PSW
 POP 30 H
 POP D
 POP B

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Microprocessor
If the sign bit of mantissa is 0 and the exponent is increased from a positive to a more negative number the result is

A smaller floating point number
A larger floating point number
Either A or B depending on the actual number
A negative floating point number

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Microprocessor
Using one 8259 IC is equivalent to providing …………. INTR pins on 8085

 12
 16
 18
 8

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Microprocessor
Which one of the following interrupt/interrupts is/are only level triggering?

 RST 6.5
 RST 5.5
 TRAP
 both ‘a’ and ‘b’

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Microprocessor
Pick out the matching pair

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

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Microprocessor
Identify the programmable DMA controller from the following

 8251
 8253
 8257
 8279

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