Microprocessor
The operating modes of 8255 A are called

Mode 0, mode 2 and mode 3
Mode 0, mode 1 and mode 2
Mode 0 and mode 2
Mode 0 and mode 1

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Microprocessor
Ready pin of microprocessor is used

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

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