Microprocessor
The operating modes of 8255 A are called

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

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Microprocessor
A microprocessor is ALU

 register unit and I/O device on a single chip.
 register unit and control unit on a single chip.
 and memory on a single chip.
 and control unit on a single chip.

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