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Microprocessor

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

 POP B
 POP PSW
 POP D
 POP 30 H

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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, 3 and 4
 1, 2 and 4
 1, 2 and 3

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Microprocessor
The program counter in a 8085 micro-processor is a 16-bit register, because

 It facilitates the user storing 16-bit data temporarily
 There are 16 address lines
 It has to fetch two 8-bit data at a time
 It counts 16-bits at a time

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Microprocessor
How many 16-bit special purpose registers are present in 8085 microprocessor?

 6
 8
 2
 16

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Microprocessor
After RESET 8255 will be in

 mode 2
 mode 0; all ports are input
 unchanged condition
 mode 0; all ports are output

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Microprocessor
Identify the non-maskable interrupt from the following

 RST 4.5
 RST 6.5
 RST 5.5
 RST 7.5

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