People like connecting devices
• A computer is much more than the CPU
• Keyboard, mouse, screen, disk drives
• Scanner, printer, sound card, camera, etc.
• These devices occasionally need CPU service
• But we can’t predict when
• External events typically occur on a macroscopic
timescale
• we want to keep the CPU busy between events
FNeed a way for CPU to find out devices need
attention
People like connecting devices
• A computer is much more than the CPU
• Keyboard, mouse, screen, disk drives
• Scanner, printer, sound card, camera, etc.
• These devices occasionally need CPU service
• But we can’t predict when
• External events typically occur on a macroscopic
timescale
• we want to keep the CPU busy between events
FNeed a way for CPU to find out devices need
attention
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