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This document discusses how input/output (IO) devices are interfaced with the 8085 microprocessor. It explains that IO ports are assigned a separate address space from main memory. The 8085 uses its IO/ and control signals to determine if an address refers to memory or an IO port. For isolated IO, the IN and OUT instructions are used to transfer data to and from ports. These instructions take three machine cycles - opcode fetch, memory read, and IO read/write. External decoding logic then uses the IO/, addr

Author

Prashant Shah

Language

EN