For BCM SEM 2
5.1Principles of I/O hardware
5.2 Principles of I/O software
5.3 I/O software layers
5.4 Disks
5.5 Clocks
5.6 Character-oriented terminals
5.7 Graphical user interfaces
5.8 Network terminals
5.9 Power management
5.10Disk Controllr
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