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Microprocessor

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

 DCR R
 DCX Rp
 ORA R
 XRA R

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Microprocessor
Maximum of how many devices can be connected simultaneously to the microprocessor via 8257 in DMA data transfer mode?

 8
 6
 4
 10

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Microprocessor
In 8086 the number of bytes which can be addressed directly is about

1000
100000
one million
10000

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Microprocessor
The forms of IF statements in FORTRAN 77 are called

Logical IF and arithmetic IF
Logical IF and Block IF
Logic IF, block IF, arithmetic IF and negate IF
Logical IF, block IF and arithmetic IF

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Microprocessor
When the write enable input is not asserted, the gated D latch _________ its output.

Can not change
Complements
Sets
Clears

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Microprocessor
After RESET 8255 will be in

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

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