Microprocessor
After RESET 8255 will be in

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

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Microprocessor
How can we make any bit of a register “1”?

 OR that bit with “1” and remaining bits with “0”.
 AND that bit with “0” and remaining bits with “1”.
 OR that bit with “0” and remaining bits with “1”.
 AND that bit with “1” and remaining bits with “0”.

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