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Microprocessor

Microprocessor
Which of the following instruction will never affect the zero flag?

 DCX Rp
 DCR R
 ORA R
 XRA R

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Microprocessor
A microprocessor with a 12-bit address bus will be able to access

 1 K bytes
 4 K bytes
 8 K bytes
 10 K bytes

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Microprocessor
Which one of the following statement is false?

 A microprocessor has bi-directional data bus
 A microprocessor has unidirectional address bus
 A microprocessor has bi-directional address bus
 A microprocessor has an ALU

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Microprocessor
Which of the following is a valid integer constant?

127
125 + 3
127
127

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Microprocessor
After RESET 8255 will be in

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

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Microprocessor
Circuit A is a 1-bit adder; circuit B is a 1 bit multiplier.[Hint: Construct the truth table for the adder and the multiplier]

Circuit B has more gates than circuit A
Circuit A has more gates than circuit B
Circuit A has the same number of gates as circuit B
None of these

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