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Microprocessor

Microprocessor
In order to complement the lower nibble of accumulator one can use

 CMA
 XRI 0FH
 ORI 0FH
 ANI 0FH

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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?

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

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Microprocessor
Assuming LSB is at position 0 and MSB at position 7, which bit positions are not used (Undefined) in flag register of an 8085 microprocessor?

 1, 3, 4
 1, 3, 5
 1, 2, 5
 2, 3, 5

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Microprocessor
Length of the instruction POP D is

 4 byte
 3 byte
 1 byte
 2 byte

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Microprocessor
Identify the programmable DMA controller from the following

 8257
 8279
 8253
 8251

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Microprocessor
The first machine cycle of an instruction is always

 A memory write cycle
 An I/O read cycle
 A memory read cycle
 A fetch cycle

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