Microprocessor
After RESET 8255 will be in

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

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Microprocessor
Ready pin of microprocessor is used

 to introduce wait state
 to provide direct memory access
 to indicate that microprocessor is ready to receive inputs
 to indicate that microprocessor is ready to receive outputs

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