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Unit3 input
- 12. IO mapped i/o Data valid Address bus i/o bus CPU Status F register IO device interface Data register Data accepted Data bus I/o read I/o write
- 17. Memory mapped i/o data Address read write Main memory CPU IO port 1 IO port 2 IO port 3 IO device A IO device B
- 18. IO mapped i/o data Address Read M write Main memory CPU IO port 1 IO port 2 IO port 3 IO device A IO device B Write M Read IO Write IO
- 27. Modes of data transfer -DMA Processor Main memory Disk/DMA controller DMA controller Printer Keyboard Network interface disk disk System bus