Computer Basic Information
The data bus in 8080A/8085 microprocessor is a group of

eight unidirectional lines that are used for I/O devices
eight lines used to transfer data among the registers
sixteen bidirectional lines that are used for data transfer between the microprocessor and memory
eight bidirectional lines that are used to transfer 8 bits between the microprocessor and its I/O and memory
None of these

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