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Microprocessor

Microprocessor
In order to save accumulator value on the stack, which of the following instruction may be used

 POP PSW
 PUSH SP
 PUSH PSW
 PUSH A

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Microprocessor
For a memory with a 16-bit address space, the addressability is

16 bits
2^16 bits
8 bits
Cannot be determined

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Microprocessor
The processor status word of 8085 microprocessor has five flags namely:

 S, OV, AC, P, CY
 S, Z, OV, P, CY
 S, Z, AC, P, OV
 S, Z, AC, P, CY

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Microprocessor
A 37 bit mantissa has an accuracy of

8 decimal places
10 decimal places
11 decimal places
6 decimal places

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Microprocessor
The reason for the presence of ALE pin in 8085, but not in 6800 is that

 8085 uses I/O mapped I/O, whereas 6800 uses memory mapped I/O
 8085 has 5 interrupts lines, whereas 6800 has only two
 None
 8085 has multiplexed bus, whereas 6800 does not have

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Microprocessor
Identify the programmable DMA controller from the following

 8279
 8253
 8251
 8257

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