Microprocessor
After RESET 8255 will be in

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

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Microprocessor
A high on RESET OUT signifies that

 processing can begin when this signal goes high
 all the registers and counters are being reset
 all the registers of the CPU are being reset
 all the registers and counters are being reset and this signal can be used to reset external support chip

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