Microprocessor
After RESET 8255 will be in

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

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Microprocessor
In a vector interrupt

 the branch address is assigned to a fixed location in memory.
 the branch address is obtained from a register in the processor.
 the interrupting source supplies the branch information to the processor through an interrupt vector.
 none.

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