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Microprocessor

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

 PUSH PSW
 PUSH SP
 PUSH A
 POP PSW

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Microprocessor
Identify the programmable DMA controller from the following

 8279
 8253
 8251
 8257

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Microprocessor
Length of the instruction POP D is

 2 byte
 3 byte
 4 byte
 1 byte

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Microprocessor
Consider the following registers: 1. Accumulator and flag register 2. B and C register 3. D and E register 4. H and L register Which of these 8-bit registers of 8085 microprocessor can be paired together to make a 16-bit register?

 2, 3 and 4
 1, 2 and 3
 1, 3 and 4
 1, 2 and 4

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

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

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Microprocessor
The frequency of the driving network connected between pins 1 and 2 of 8085 microprocessor is

None of these
 four times the desired frequency
 twice the desired frequency
 equal to the desired frequency

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