Computer Microprocessor and Assembly Language

281. Which are used for port A in 8255 mode 1:

1. PC0-PC2
2. PC3-PC7
3. PC6-PC7
4. PC3-PC5

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282. Which are used for port B in 8255:

1. PC0-PC2
2. PC3-PC7
3. PC6-PC7
4. PC3-PC5

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283. Which bus plays a crucial role in I/O:

1. System bus
2. Control bus
3. Address bus
4. Both A and B

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284. Which causes the microprocessor to immediately terminate its present activity:

1. RESET signal
2. INTERUPT signal
3. Both
4. None of these

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285. Which chip is used for analogue to digital converter:

1. 809
2. 808
3. Both a & b
4. None of these

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286. Which chip is used for DAC:

1. AD7521
2. AD7522
3. AD7523
4. AD7524

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287. Which chip used for AD&DA converters in 8086 processor:

1. 8251
2. 8255
3. 8254
4. 8259

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288. Which converters convert binary number into their equivalent voltages:

1. Analogue to analogue
2. Analogue to digital
3. Digital to digital
4. Digital to analogue

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289. Which corporation decided to use 8088 microprocessor in personal computer:

1. IBM
2. CRT
3. PMN
4. SPS

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290. Which flag are used to record specific characteristics of arithmetic and logical instructions:

1. The stack
2. The stand
3. The status
4. The queue

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