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Microprocessor

Microprocessor
What is the size (in bytes) of Prefetch queue in 8086?

 3.
 2.
 6.
 4.

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Microprocessor
Let the content of accumulator and register B be 0000 0100 and 0100 0000 respectively before execution of instruction SUB B. The content of accumulator after the execution of this instruction will be

 01000000
 00000100
 010001000
 11000100

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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
 None
 8085 has multiplexed bus, whereas 6800 does not have
 8085 has 5 interrupts lines, whereas 6800 has only two

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Microprocessor
In 8085 name/names of the 16 bit registers is/are

 both A and B.
 program counter.
 none of these.
 stack pointer.

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

 DCR R
 XRA R
 DCX Rp
 ORA R

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Microprocessor
PSW stands for

 accumulator contents
 accumulator and flag register contents
 none
 flag byte

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